TABLE OF CONTENTS


1.0 OVERVIEW 3
1.1 Features 4
1.2 Operation 4
  Figure 1 5
1.3 Programming the PCM Encoder 6
1.4 A/D Converter 7
1.5 Analog Signal Conditioning/Multiplexer 8
1.5.1 MUX64S: 64 Channel Analog Multiplexer 9
1.5.2 MUX32D: 32 Channel Differential Multiplexer 10
1.5.3 F4DIFMUX: 8 Channel Analog Multiplexer 11
1.5.4 F6MUX: 16 Channel Analog Multiplexer 12
1.5.5 F6MUX-PRG: 5 Channel Analog Multiplexer 13
1.6 IRIG TIMING 14
1.7 FRAME COUNT CAPABILITY 15
2.0 CONNECTORS 16
2.1 J2, J3 and J4 Connectors 16
2.2 J1 Connector 16
2.2.1 J1 51 Pins, 24 Bilevel Bits 16
2.2.2 J1 B100 Pins, Up to 72 Bilevel Bits 18
3.0 BOOT MODE 21
4.0 ELECTRICAL SPECIFICATIONS 21
5.0 MECHANICAL SPECIFICATIONS 21
6.0 PC SOFTWARE 21
6.1 PC Software Installation 21
6.2 PC COM Port Hardware 21
6.3 Prog9.exe 21
6.3.1 Download to PCM EEPROM from File 22
6.3.2 Download to PCM EEPROM 1 Word 22
6.3.3 Upload PCM EEPROM to File 22
6.3.4 Read PCM EEPROM in Blocks 22
6.3.5 Set Bits/Word 22
6.3.6 Set Clock Rate 22
6.3.7 Set Output Code 22
6.3.8 Set PCM EEPROM Page 23
6.3.9 Select PCM ASYNC Data Type 23
6.3.10 Select PCM ASYNC Data Baud Rate 23
6.3.11 Select PCM ASYNC CTS Buffer Delay 23
6.3.12 Enter DVM Mode 23
6.3.13 Diagnostics - TBS 23
6.3.14 File Manipulation 23
7.0 ASYNCHRONOUS DATA TRANSMISSION 24
8.0 SYNCHRONOUS DATA TRANSMISSION 25
9.0 DVM MODE 26
10.0 GETTING STARTED 26
11.0 NOISE CONSIDERATION 26

 

1.0 Overview The PCM2 encoder series are microminiaturized, rugged programmable encoders. They are fabricated using thick film, multilayer hybrid technology to provide small size and to withstand rugged environmental conditions. All parameters are programmed via an RS232 asynchronous interface. This interface (4 wires) is connected to the COM1 or COM2 port on any IBM PC or compatible computer. The software for the PC is supplied with the encoder. The encoder does not have to be removed from the test unit or taken apart or wires soldered to be programmed. The encoder is available in 2 different speed versions, 8 data rates up to 1 Mega BPS or 8 data rates up to 10 Mega BPS. 1.1 Features   1.2 Operation Refer to figure 1.0 on page 5 for the following discussion. The heart of the encoder is an 8k*16 EEPROM with associated counter. The counter increments the address to the EEPROM (at the PCM word rate) which in turn outputs 16 bits of data. The 16 bits of data, stable for 1 PCM word time are used by the encoder to select multiplexer input, A/D converter gain and offset, PCM sync data, and can reset the counter to address 0 (of the selected page, see below) to complete one PCM frame. The counter is 11 bits wide, and therefore the frame length can be up to 2048 words. The 2 most significant EEPROM address bits do not come from the counter and remain stable and provide for 4 frame formats to be stored in the EEPROM, hereafter referred to as pages. The page is programmed via the PC COM port and remains the same until reprogramming. As an option, the encoder can be ordered to support frame lengths up to 8096 words. The 2 most significant bits of the 16 bit EEPROM word (shown below) define the following four conditions for the encoder hardware:

condition 1: ANALOG
 
MSB 0 0 G2 G1 G0 O2 O1 O0  SEL7  SEL6  SEL5  SEL4  SEL3  SEL2  SEL1  SEL0  LS

Selects analog mux input at address SEL7-SEL0 (256 possible analog inputs), with ADC gain of G2-G0 (8 gains), with ADC offset of O2-O0 (8 offsets). On versions above 1 Mega BPS, programmable gain and offset is not available at this time. For more then 256 analog inputs, gain or offset bits must be sacrificed.

condition 2: DIGITAL

* means don't care
                                          *
MSB 0 1 X X X X X X SEL7 SEL6 SEL5 SEL4 SEL3 SEL2 SEL1 SEL0 LSB

Selects digital mux input at address SEL7-SEL0 (256 possible digital mux inputs). The digital mux supplies serial data of 1 word length for each input. Standard with each encoder are the following digital mux inputs:
 
 
DIGITAL MUX INPUT  SEL7-SEL0
BILEVEL WORD 1 250
BILEVEL WORD 2 251
 **BILEVEL WORD 3 248 **OPTION
**BILEVEL WORD 4 249 **OPTION
**BILEVEL WORD 5 254  **OPTION
**BILEVEL WORD 6 255 **OPTION
SERIAL SYNCHRONOUS WORD 252
RS232/RS422 ASYNCHRONOUS WORD 253
FRAME COUNTER 240
IRIG TIME B  241

condition 3: SYNC

 * X means don't care
                                                *
MSB  1  0 X  X SY11 SY10 SY9 SY8 SY7 SY6 SY5  SY4 SY3 SY2 SY1 SY0   LSB

Causes sync data SY11-SY0 to be inserted into the PCM data stream. For word sizes less than 12 bits, the syncs LSB's are discarded.

condition 4: SYNC AND RESET FRAME

* X means don't care
                                                *
MSB 1 1 X X SY11 SY10 SY9 SY8 SY7 SY6 SY5 SY4 SY3 SY2  SY1 SY0 LSB

Causes sync data SY11-SY0 to be inserted into the PCM data stream and the EEPROM address counter to reset. Resetting the counter causes the completion of one complete PCM major frame. For word sizes less than 12 bits, the syncs LSB's are discarded.

The 4 conditions described above can be used to generate any possible frame with sub and super commutation up to a major frame length of 2048.

 1.3 Programming the PCM Encoder The RS232 asynchronous programming port is used to program the encoder. This port consists of 4 signals, which are connected to an IBM PC or compatible COM1 or COM2 port. The 4 signals are DGND (Ground), RTS (Request To Send), T232 (Transmit data) and R232 (Receive data). When RTS is set true by the PC, the encoder enters the programming mode and accepts commands and data (8 serial asynchronous bits) via the R232 pin and echoes these commands or data on the T232 pin. The encoder leaves the programming mode when RTS is set false. The powered up or unpowered PC can be connected to the powered up or unpowered encoder. However once a programming command is issued to the encoder, the PC should remain connected to the powered encoder until the programming is completed so that complete programming is preformed and so that both the PC and encoder do not hang waiting for data. If this happens, the PC program must be restarted to recycle RTS and the programming sequence restarted. The encoder pulls RTS false when the PC is disconnected so that the programming mode cannot be entered.

PC software is provided with the encoder, which performs the programming. When executing the software and the main programming menu is displayed on the PC, RTS is false so the encoder acts as if the PC is not connected. RTS is set true only after a command is issued.

One of the commands provided with the PC software is installation. This command needs to be executed only once to determine which COM port the encoder is connected to. The COM port information is stored on disk..

The encoder EEPROM is programmed from files stored on your PC disk. These files can be generated with the software provided or can be manually generated or edited. The file format is now described. Each line (record) in the file contains one byte (8 bits) of information. Each two consecutive bytes form one word of EEPROM data. The most significant byte is stored first.

For example:
 
BYTE#  VALUE  MEANING
1 $40 most significant byte stored at EEPROM address 0
2  253 least significant byte stored at EEPROM address 0
3  58 most significant byte stored at EEPROM address 1
4  3 least significant byte stored at EEPROM address 1
5  $CA most significant byte stored at EEPROM address 2
6  $AA  least significant byte stored at EEPROM address 2

After programming, page 1 of the EEPROM will look as follows:

adrs 0 MSB -> 0 1 0 0 0 0 0 0 1 1 1 1 1 1 0 1 <- LSB

adrs 1 MSB -> 0 0 1 1 1 0 1 0 0 0 0 0 0 0 1 1 <- LSB

adrs 2 MSB -> 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 <- LSB

This program will generate a PCM frame length of 3 words. The first word will be RS232/RS422 data. The second word will be analog channel at mux address 3, of gain given by code 7 and offset given by code 2. The third word will be a sync word of alternating ones and zeroes.
 
 

 1.4 A/D Converter Four different A/D converters are available, two for bit rates up to 1 Mega BPS and two for bit rates up to 10 Mega BPS. All A/D converters work down to DC. Either rate can be ordered with a Programmable Gain Amplifier (PGA) and a Programmable Offset Amplifier (POA).

A/D Converters:
 
1MBit Standard
1MBit Programmable Gain & Offset
10MBit Standard
10MBit Programmable Gain & Offset

The PGA provides 8 gains from one to ten:

       STANDARD           EEPROM CODE
GAINS
G2
G1
G0
1
0
0
0
2
0
0
1
3
0
1
0
4
0
1
1
5
1
0
0
6
1
0
1
8
1
1
0
10
1
1
1

 
 
 

The POA provides 8 offsets from +0.5 Volts to -3.0 Volts:

STANDARD EEPROM CODE

OFFSETS O2 O1 O0

+0.5 Volts 0 0 0

0 Volts 0 0 1

-0.5 Volts 0 1 0

-1.0 Volts 0 1 1

-1.5 Volts 1 0 0

-2.0 Volts 1 0 1

-2.5 Volts 1 1 0

-3.0 Volts 1 1 1

Consult factory for non-standard gains and offsets. Gain and offset is programmed on a PCM word sample basis. Shown below is a block diagram of the PGA, POA and ADC:

Note that offset is inserted after gain. Gain and offset should be selected to condition to ADC full scale (-2.5V to +2.5V).
 
 

Example:

The input from the Analog Multiplexer ranges from 0 to 5 volts. Select a gain of 1 and an offset of -2.5 volts.
 
 

Example:

The input from the Analog Multiplexer ranges from 0 to 0.5 volts. Select a gain of 10 and an offset of -2.5 volts.
 
 

Example:

The input from the Analog Multiplexer ranges from -0.25 to +0.25 volts. Select a gain of 10 and an offset of 0.0 volts.
 
 

 1.5 Analog Signal Conditioning/Multiplexers  

Various signal conditioning/multiplexing hybrids are available for the PCM Encoder. These hybrids are integrated within the encoder and are described in this section.

 1.5.1 MUX64S: 64 Channel Analog Multiplexer  
 


 

 1.5.2 MUX32D: 32 Channel Differential Multiplexer with Amplification  
 


 

 1.5.3 F4DIFMUX: 8 Channel Analog Multiplexer with Bridge Signal Conditioning, Voltage Excitation and 4 Pole Low Pass Filtering.  
 


 

 1.5.4 F6MUX: 16 Channel Analog Multiplexer  
 


 

 1.5.5 F6MUX-PRG: 5 Channel Analog Multiplexer with 5,6 Pole Programmable Low Pass Filters and Amplification  
 


 

 1.6 IRIG Timing The PCM Encoder can have an IRIG B timing capability. The PCM Encoder IRIG B electronics synchronizes with an external IRIG B input after the signal has been applied to the input for a maximum of 10 seconds. The external signal shall be removable and the unit will maintain IRIG Time consistent with the drift rate specifications of the internal oscillator. The IRIG B time is current with the beginning of the first bit of the frame sync (subtraction of consecutive IRIG B times equals the frame rate the PCM data output). Input Standard IRIG B serial time code modulating 1000hz sine wave carrier.

Input Amplitude: 0.1 volts to 10 volts peak to peak without adjustment.

Input Impedance: 100k ohms minimum.

Internal Oscillator: 0 to +50°C, + or -5ppm, aging 10-7/day (optional).

Power: +24 to 32 VDC.

IRIG B Timing Configuration

The IRIG timing has form hours through microseconds as shown below:

The IRIG data takes 4, 16 bit words and is in the following format:

Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit

63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48

X X X X X X 200 100 80 40 20 10 8 4 2 1

| | Days |

Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit

47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32

X X 20 10 8 4 2 1 X 40 20 10 8 4 2 1

| | Hours | | Minutes |

Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

X 40 20 10 8 4 2 1 800 400 200 100 80 40 20 10

| | Seconds | Milliseconds |

Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

8 4 2 1 800 400 200 100 80 40 20 10 8 4 2 1

| Milliseconds | Microseconds |
 
 

Programming the encoder to select the IRIG Time word places the IRIG time word into the PCM bit stream. Multiple words are programmed to obtain all 64 Bits. The least significant bit of the 64 bit IRIG time word is transmitted first.

The EEPROM code (section 1.2) to select one PCM word length of IRIG time is:

EEPROM Upper Byte (Hex) $40

EEPROM Lower Byte (Decimal) 241

The following PCM EEPROM program at 10 bits per word will place 70 bits of IRIG time data into the PCM data stream:

$40, 241 LSB Transmitted First

$40, 241

$40, 241

$40, 241

$40, 241

$40, 241

$40, 241 Most Significant Upper Bits are Zero Filled

The following PCM EEPROM program at 10 Bits/word will place 20 bits of IRIG Time data into the PCM data stream:

$40, 241 LSB

$40, 241

 1.7 Frame Count Capability The unit has an internal frame counter that can be transmitted if programmed to. The unit increments the frame counter each frame. The frame counter is resettable via the rising edge of an external applied signal.

The frame counter length is dependent on the number of bits per word:
 
 
 
Bits/Word  Frame Counter Length
6 24
7 21
8 24
9 27
10 20
11 22
12 24

 

Programming the encoder to select the frame counter (for the digital mux) always reads the most significant word of frame count first. Multiple reads complete the total number of words.

The EEPROM code (section 1.2) to select one PCM word length of frame count is:

EEPROM Upper Byte (Hex) $40

EEPROM Lower Byte (Decimal) 240

The following PCM EEPROM program at 8 bits/word will place 24 bits of frame count into the PCM data stream:

$40, 240

$40, 240

$40, 240 Least Significant Frame Counter Bits

 2.0 CONNECTORS (Pin Description) 2.1 J2, J3 and J4 Connectors See outline drawing. This pinout varies with the encoder ordered. These connectors provide the analog multiplexer connections. 2.2 J1 Connector: J1 is either a 51 pin or a 100-pin connector depending on the number of bilevel channels ordered. 2.2.1 J1 51 Pin Connector, 24 Bilevel Bits on J1. NRZ-L: Pin 1, non-return to zero output.

0 DEGCLK: Pin 2, Clock output at bit rate. Eight bit rates are provided. The bit rate selection is stored in internal EEPROM and is initialized at power up and after programming.
 
STANDARD BIT RATES
 1 MEGA BIT VERSION 10 MEGA BIT VERSION
1MBIT 10MBIT
500KBIT 5MBIT
250KBIT 2.5MBIT
125KBIT 1.25MBIT
62.5KBIT 625KBIT
31.25KBIT 312.5KBIT
15.625KBIT 156.25KBIT
7.8125KBIT  78.125KBIT

 
 
 
 
 
 

Note: Non-standard internally generated bit rates are a factory option. Eight bit rates are provided in a divide by 2 fashion.

Note: An external clock source can generate non-standard desired bit rates. Bit rates for both encoder versions can go down to DC.

CODE: Pin 3, one of nine PCM output codes. The output code selection is stored in internal EEPROM and is initialized at power up and after programming. The output code signal is output to the external premod filter connector for pre-modulation filtering. The filtered signal is output is available at the external premod filter.

POSSIBLE OUTPUT CODES

NRZ-L

NRZ-M

NRZ-S

BIO-L

BIO-M

BIO-S

DM-M

DM-S

RNRZ-L

232PLS: Pin 4, pulse output. This pulse occurs each time an asynchronous word (RS232 or RS422) is inserted into the PCM data stream. This signal can be sued to monitor the asynchronous data word inserted.

DGND: Pin 6, Digital ground. Reference bilevel inputs, PCM outputs, clocks, diagnostic signals to this ground.

BI0, BI1, ... BI10, BI11: Pins 7 to 18, Bilevel inputs, word 1.

BI0 -> LSB.

BI11 -> MSB.

LSB's are discarded for word sizes less than 12.

BI12, BI13, ... BI22, BI23: Pins 22 to 33, Bilevel inputs, word 2.

BI12 -> LSB.

BI23 -> MSB.

LSB's are discarded for word sizes less than 12.

RTS: Pin 19, Request to Send, for encoder programming. Connect to PC COM1 or COM2 port for programming. Referenced to DGND or B+RTN.

T232: Pin 20, Transmit RS232 asynchronous serial data output from encoder to PC during encoder programming. Connect to PC COM1 or COM2 port for programming. Referenced to DGND or B+RTN.

R232: Pin 21, Receive RS232 asynchronous serial data input to encoder from PC for programming encoder. Connect to PC COM1 or COM2 port for programming. Referenced to DGND or B+RTN.

DGND: Pin 34, Digital ground. Reference bilevel inputs, PCM outputs, clocks, diagnostic signals to this ground. Connected to AGND and B+RTN internal to the encoder.

B+RTN: Pin 38, B+ return (Encoder power ground).

B+RTN: Pin 39, B+ return (Encoder power ground).

B+28V: Pin 40, B+ (+28V +- 6V).

B+28V: Pin 41, B+ (+28V +- 6V).

CHASSIS GND: PIN 42, Case ground, isolated from all other grounds.

R422+: Pin 43, RS422 asynchronous receive data input, positive polarity referenced to R422-.
 
 










J1 51 PIN CONFIGURATION

R422-: Pin 44, RS422 receive asynchronous data input, negative polarity referenced to R422+ when the asynchronous data port is programmed for RS422 specification. If the asynchronous data port is programmed for RS232 specification, this pin is the positive polarity RS232 asynchronous data input referenced to DGND or B+RTN. The asynchronous data port specification selection is stored in internal EEPROM and is initialized at power up and after programming (RS232 or RS422).

FRMSNC: Pin 48, Frame sync pulse output.

WRDSNC: Pin 49, Word sync pulse output.

2X CLKIN: Pin 50, Clock input, two times the bit rate. Connect to 2X CLKOUT for internally generated bit rates. For externally generated bit rates, connect to an external clock source of the desired bit rate (CMOS or TTL).

2X CLKOUT: Pin 51, Clock output, two times the bit rate. Connect to 2X CLKIN for internally generated bit rates.

 2.2.2 J1 100 Pin Connector, up to 72 bilevel bits on J1. NRZ-L: Pin 1, None Return to Zero Output.

0 DEGCLK: Pin 2, Clock output at bit rate. Eight bit rates are provided. The bit rate selection is stored in internal EEPROM and is initialized at power up and after programming.

STANDARD BIT RATES

1 MEGA BIT VERSION 10 MEGA BIT VERSION

1MBIT 10MBIT

500KBIT 5MBIT

250KBIT 2.5MBIT

125KBIT 1.25MBIT

62.5KBIT 625KBIT

31.25KBIT 312.5KBIT

15.625KBIT 156.25KBIT

7.8125KBIT 78.125KBIT

Note: Non standard internally generated bit rates are a factory option. Eight bit rates are provided in a divide by 2 fashion.

Note: An external clock source can generate non standard desired bit rates. Bit rates for both encoder versions can go down to DC.

CODE: Pin 3, One of seven PCM output codes. The output code selection is stored in internal EEPROM and is initialized at power up and after programming. The output code signal is output to the external premod filter connector for pre-modulation filtering. The filtered signal is output is available at the external premod filter.

POSSIBLE OUTPUT CODES

NRZ-L

NRZ-M

NRZ-S

BIO-L

BIO-M

BIO-S

RNRZ-L

232PLS: Pin 68, Pulse output. This pulse occurs each time an asynchronous word (RS232 or RS422) is inserted into the PCM data stream. This signal can be used to monitor the asynchronous data word inserted.

DGND: Pin 52, 53, 66, 67 Digital ground. Reference bilevel inputs, PCM outputs, clocks, diagnostic signals to this ground. Connected to AGND and B+RTN internal to the encoder.

BI0, BI1,...BI10, BI11: Pins 26 down to 15, Bilevel inputs, word 1

BI0 -> LSB.

BI11 -> MSB.

LSB's are discarded for word sizes less than 12.

BI12, BI13,...BI22, BI23: Pins 51 down to 40, Bilevel inputs, word 2

BI12 -> LSB.

BI23 -> MSB.

LSB's are discarded for word sizes less than 12.

BI24, BI25,...BI34, BI35: Pins 39 down to 28, Bilevel inputs, word 3

BI24 -> LSB

BI35 -> MSB

LSB's are discarded for word sizes less than 12.

BI36, BI37,...BI46, BI47: Pin 27, Pins 14 down to 4. Bilevel inputs, word 4

BI36 ->LSB.

BI47 ->MSB.

LBS's are discarded for word sizes less than 12.

BI48, BI49,...BI58, BI59: Pins 65 down to 54, Bilevel inputs, word 5

BI 48 -> LSB.

BI 59 -> MSB.

LBS's are discarded for word sizes less than 12.

BI60, BI61,...BI70, BI71: Pins 92 down to 81, Bilevel inputs, word 6

BI 60 -> LSB.

BI 71 -> MSB.

LBS's are discarded for word sizes less than 12.

RTS: Pin 96, Request to Send, for encoder programming. Connect to PC COM1 or COM2 port for programming. Referenced to DGND or B+RTN.

J1 100 PIN CONFIGURATION

T232: Pin 98, Transmit RS232 asynchronous serial data output from encoder to PC during encoder programming. Connect to PC COM1 or COM2 port for programming. Referenced to DGND or B+RTN.

R232: Pin 97, Receive RS232 asynchronous serial data input to encoder from PC for programming encoder. Connect to PC COM1 or COM2 port for programming. Referenced to DGND or B+RTN.

B+RTN: Pin 77, B+ return (Encoder power ground).

B+RTN: Pin 78, B+ return (Encoder power ground).

B+28V: Pin 79, B+ (+28V +- 6V).

B+28V: Pin 80, B+ (+28V +- 6V).

CHASSIS GND: PIN 76, Case ground, isolated from all other grounds.

R422+: Pin 94, RS422 asynchronous receive data input, positive polarity referenced to R422-.

R422-: Pin 95, RS422 receive asynchronous data input, negative polarity referenced to R422+ when the asynchronous data port is programmed for RS422 specification. If the asynchronous data port is programmed for RS232 specification, this pin is the positive polarity RS232 asynchronous data input referenced to DGND or B+RTN. The asynchronous data port specification selection is stored in internal EEPROM and is initialized at power up and after programming (RS232 or RS422).

FRMSNC: Pin 100, Frame sync pulse output.

WRDSNC: Pin 99, Word sync pulse output.

2X CLKIN: Pin 75, 2X Clock input. Connect to 2X CLKOUT for internally generated bit rates. For externally generated bit rates, connect to an external clock source of the desired bit rate (CMOS or TTL) times 2.

2X CLKOUT: Pin 74, 2X Clock output. Connect to 2X CLKIN for internally generated bit rates.
 
 


















J1 100 PIN CONFIGURATION

 3.0 Boot Mode The encoder has the capability to be reconfigured in the field. Within the encoder is an microcontroller containing EEPROM. The EEPROM can be modified in the field. The microcontroller EEPROM is modified via the IBM PC using the encoder programming RS232 port. To modify the microcontroller EEPROM the BOOT pin is connected to ground and the Quad Tron provided microcontroller code is downloaded to the encoder via the RS232 port programming port. For normal operation, the BOOT pin must be left unconnected. Boot capability allows Quad Tron to update fielded encoders by providing the user a disk. The user simply runs the program provided on the disk. If the user has special requirements, the encoder can be changed in the field to meet these requirements.

Some update possibilities are time code (PCM digital word) generation, both 8 and 9 bit asynchronous data format, user specified asynchronous and synchronous data format, expanded DVM mode, etc.
 
 
 
 

 4.0 Electrical Specification - TBS 5.0 Mechanical Specifications - TBS 6.0 PC Software 6.1 PC Software Installation The diskette provided contains 4 files. Copy them into the directory you plan to use when programming your encoder. The files are:

PROG9.EXE - Execute this program to program the encoder.

PFIG.DAT - Encoder configuration file that must be located in the same directory as PROG9.EXE.

PINST.DAT - PC installation file that must be located in the same directory as PROG9.EXE.

USER.DOC - File containing this document.

 6.2 PC COM Port Hardware Setup Connect from either the PC COM1 or COM2 port the following signals to the encoder:

COM PORT PIN:

ENCODER SIGNAL (25 pin style)

GND - Ground, J1-38 7

RTS - Request To Send, J1-19 4

T232 - Serial Data from Encoder to PC, J1-20 3

R232 - Serial Data from Encoder to PC, J1-20 2

 6.3 PROG9.EXE PC Software Type PROG9 at the DOS command prompt and the main menu appears. One time and one time only you must enter 15 to install the software. Entering 15 will prompt the user for the COM port that the encoder is connected to. Answer the question and the information is stored on the disk. Type Q to return to DOS if desired.
          6.3.1 1 DOWNLOAD TO PCM EEPROM FROM FILE Entering 1 will enable the user to download to the encoder EEPROM information contained in a file stored in the current working directory. The user is prompted to enter the EEPROM page, the filename and the starting address of EEPROM within the page to begin storing the data. 6.3.2 2 DOWNLOAD TO PCM EEPROM 1 WORD (2 BYTES) Entering 2 will enable the user to download to the encoder EEPROM information typed in from the keyboard. The user is prompted to enter the EEPROM page, and the starting address of EEPROM within the page to begin storing the data. Data at the selected address is displayed. Enter new data if desired. Press Enter to continue to the next address. Type (.) to return to the main menu. 6.3.3 3 UPLOAD PCM EEPROM TO FILE Entering 3 will enable the user to upload data from the encoder EEPROM to a file stored in the current working directory. The user is prompted to enter the EEPROM page, the filename and the starting address of EEPROM within the page to begin uploading data. 6.3.4 4 READ PCM EEPROM IN BLOCKS Entering 4 will enable the user to upload and display encoder EEPROM data. The user is prompted to enter the EEPROM page and the starting address of EEPROM within the page to begin uploading data. Data is displayed in blocks starting at the selected address. Press Enter to display the next block of data. Type (.) to return to the main menu. 6.3.5 5 SET BITS/WORDS Entering 5 will enable the user to select the desired bits/word (from 6 to 12). The bits/word data is stored in EEPROM and is used at power up and after programming to set the bits/word.

          The encoder must be powered up.

                     6.3.6 6 SET CLOCK RATE Entering 6 will enable the user to select the desired bit rate (8 possibilities) when using the internal clock (connect CLKIN to CLKOUT for internally generated rates). The clock rate is stored in EEPROM and is used at power up and after programming to set the bit rate.

          The encoder must be powered up.

                     6.3.7 7 SET OUTPUT CODE Entering 7 will enable the user to select the desired output code (9 possibilities, see CODE pin description). The output code is stored in EEPROM and is used at power up and after programming to set the desired code output at the CODE pin and input to the externally connected premod filter.

          The encoder must be powered up.

                     6.3.8 8 SET PCM EEPROM PAGE Entering 8 will enable the user to select the desired encoder EEPROM page (4 possibilities). The selected page stored in EEPROM and is used at power up and after programming to generate the page programmed PCM data stream.

          The encoder must be powered up.

                     6.3.9 9 SELECT PCM ASYNC DATA TYPE (RS232 OR RS422) Referring to Figure 1, asynchronous data PCM input is multiplexed as either RS232 or RS422. Entering 9 allows the user to select the asynchronous data type. The selected data type is stored in EEPROM and is initialized at power up and after programming.

          The encoder must be powered up.

                     6.3.10 10 SELECT PCM ASYNC DATA BUAD RATE Entering 10 allows the user to select the baud rate for asynchronous data PCM input. The selected baud rate is stored in EEPROM and is initialized at power up and after programming.

          The encoder must be powered up

                     6.3.11 12 SELECT PCM ASYNC CTS BUFFER DELAY Entering 12 allows the user to select the byte delay used to set CTS false when programming asynchronous PCM data. CTS is set false the selected byte delay prior to the FIFO being filled and set true otherwise. The selected CTS byte delay is stored in EEPROM and is initialized at power up and after programming.

          The encoder must be powered up.

                     6.3.12 13 ENTER DVM MODE Entering 13 allows the user to enter the DVM mode as described in section 9.0. To exit the DVM mode, type a period (.).

          The encoder must be powered up.

                     6.3.13 14 DIAGNOSTICS - TBS 6.3.14 18 FILE MANIPULATION
7.0 Asynchronous Data Transmission Eight bit asynchronous data is input to the encoder FIFO RAM buffer (200 bytes) and inserted into the PCM data stream when programmed to do so. The programming code (EEPROM word) for RS232/RS422 ASYNCHRONOUS WORD is $40FD. Each time this code is encountered within the PCM frame, data is taken from the RAM FIFO and inserted (along with other status bits) into the PCM data stream as one PCM word. Data is input to the FIFO from either the RS232 port or RS422 port. The baud rate for the asynchronous data input along with RS232/RS422 port selection is stored in internal EEPROM and is initialized at power up and after programming. The baud rate and data port selections are parameters that are programmable via the PC.
 
 

PCM WORD FORMAT FOR RS422 OR RS232 ASYNCHRONOUS DATA

With BIT 11 the most significant bit and BIT 0 the least significant bit:

BIT 11 to BIT 4: Data.

BIT 3: Set to 1 if FIFO buffer underflowed (no new data to transmit), set to zero otherwise. When this bit is set to 1, the data transmitted in BIT 11 to BIT 4 is repeated from the previous asynchronous data.

BIT 2: Set to 1 if FIFO buffer overflowed, set to zero otherwise. When this bit is set to 1, the data transmitted in BIT 11 to BIT 4 is the most recent received data.

BIT 1: Parity.

BIT 0: Spare.

Note: As the number of bits per word is reduced from 12, the least significant bits are discarded (not transmitted).

Note: Both 8 and 9 bit asynchronous data formats can be ordered, see boot mode.

RS422/RS232 ASYNCHRONOUS DATA BAUD RATES

0 125.00K BAUD 16 31.250K BAUD

1 62.50K BAUD 17 15.625K BAUD

2 31.25K BAUD 18 7812.5 BAUD

3 15.625K BAUD 19 3906 BAUD

4 7812.5 BAUD 20 1953 BAUD

5 3906 BAUD 21 977 BAUD

6 1953 BAUD 22 488 BAUD

7 977 BAUD 23 244 BAUD

8 41.666K BAUD 24 9600 BAUD

9 20.833K BAUD 25 4800 BAUD

10 10.417K BAUD 26 2400 BAUD

11 5208 BAUD 27 1200 BAUD

12 2604 BAUD 28 600 BAUD

13 1302 BAUD 29 300 BAUD

14 651 BAUD 30 150 BAUD

15 326 BAUD 31 75 BAUD
 
 

Note: Other baud rates are optionally specified when ordered
 
 

The Clear To Send (CTS) signals (both RS422 and RS232) are set true by the encoder when the FIFO buffer is not full. CTS can be polled by external hardware to prevent FIFO buffer overflow when transmitting asynchronous data to the encoder. CTS can be programmed to be set false when less then a certain number of FIFO locations are empty and set true otherwise. The CTS time parameter is stored in EEPROM and is initialized at power up and after programming. This parameter in useful when the external hardware buffers its data link to the encoder.

The encoder outputs the diagnostic signal 232PLS, which is a pulse that occurs when an asynchronous data word is inserted into the PCM data stream. This signal can be used to monitor the asynchronous data word inserted. The encoder also outputs the 8 bit data byte on its RS232 programming port at the programmed baud rate when the data and status is inserted into the PCM data stream.
 
 

 8.0 Synchronous Data Transmission Four signals are optionally available for synchronous data input to the encoder, SCLK, SS, MOSI, and MISO. Under Programming control, the synchronous data is buffered and output into the PCM data stream. Serial synchronous data can be input to the encoder up to data rates of 2 MEGA BITS per second. Although both encoder speed versions support the synchronous data transfers input from DC to 2 MEGA BPS, most likely use of high speed encoder synchronous data I/O transfer capability is with the 10 MEGA BIT encoder. 9.0 DVM Mode The DVM mode is for ease of system debug. The DVM mode is accessible when the encoder is connected to a PC. Encoder analog multiplexer input voltage levels are displayed on the PC monitor as digital equivalent code representations. Enter the DVM mode, via the PC, and select the desired encoder analog multiplexer input channel. The PC and encoder interactively communicate, displaying on the PC monitor the digital voltage representations of the selected analog multiplexer input channel. The DVM mode uses page 3 of the encoder EEPROM. The encoder saves and restores the first 6 byte locations of page 3 EEPROM. If the DVM mode is interrupted prior to completion, the first 6 bytes of page 3 will be lost. In this case, page 3 of the EEPROM must be re programmed. 10.0 Getting Started The encoder will be damaged without proper heat sinking. The encoder needs to be mounted or placed on a plate of metal to avoid excessive heat damage. The encoder model number must be visible and the opposite side in contact with the mounting plate.

If not using an external clock, connect 2X CLOCKIN to 2X CLOCKOUT.

Connect to PC if programming.

Apply power.

 11.0 Noise Considerations 1. All unused single ended or differential inputs should be connected to AGND. This is because the multiplexers are high input impedance and unconnected wires easily pick up noise. These noisy lines run very close to the connected signal lines causing noise pick up on both signal and analog ground (AGND) lines. Floating inputs can also cause internal amplifier saturation.

2. Connectors J2, J3 and J4 contain precision analog signals and J1 contains digital signals with fast rise times. To avoid noise pickup J1 signals should be separated from J1, J2, J3 and J4 signals. Clock signals are good noise sources and these lines should be kept as short as possible. The loop from clockout to clockin should be kept as short as possible (Close to the connector). Wires not allocated on the connector pinout should be cut off at the mating connector.

3. Power ground (J1-38, J1-39) pins should both be connected to the power supply return. Power ground and B+ lines should be as low resistance as possible.

4. Analog differential plus and minus input signals on multiplexer connectors should be run as twisted pairs. Analog ground may be used as a shield. This applies to differential signals only.

5. Analog ground signals should all be connected to the transducer ground source to provide as low resistance as possible.
 
 
 
 
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