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In such a case, the READY light on the front panel will blink. To clear the error, the computer must
first receive the status code (either as part of the normal transmitted data, or by requesting
status with the STA command). It then must send a valid command to the Card Reader.
The following table contains a list of the commands that can be sent (via the TRS-80) to the CR-510.
Each command is composed of three ASCII characters. The commands are executed in a first
in/first out (FIFO) order.
Note: RTX (retransmit the last card data, in the buffer,) is an exception. It may be required to
violate the FIFO order of execution. A command string that reads a card, changes the data format,
then asks for a retransmit, must retransmit the previous card data in its original format. Then it will
change the CR-510's format. For example,
ASC PIK BNI RTX PIK
will send ASCII data (1st PIK), ASCII data (RTX of 1st PIK), and Binary data (last PIK).
Command Command Type
Function
ASC Format
BN1 Format
BN2 Format
HX1 Format
HX2 Format
NUM Format
GR1 Format
GR2 Format
Convert to ASCII (1 byte)
Binary I format (2 bytes)
Binary II format (2 bytes)
Hexadecimal I conversion (3 bytes)
Hexadecimal II conversion (3 bytes)
Numeric format (1 byte)
Grader I Conversion (2 bytes)
Grader II Conversion (2 bytes)
CFD
DFD
SFD
Feed Mode
Feed Mode
Feed Mode
Continuous Feed
Demand Feed
Single Feed
PIK
STA
RTX
Transmit
Transmit
Transmit
Pick a card
Get unit status
Retransmit last card
EC0 Unit Override
EC1 Unit Override
LF0 Unit Override
LF1 Unit Override
ST0 Unit Override
ST1 Unit Override
Character echo disabled
Character echo enabled
Line Feed after Carriage Return disabled
Line Feed after Carriage Return enabled
Unit status not returned with data
Unit status returned with data
ATN
LOD
RES
Miscellaneous
Miscellaneous
Miscellaneous
Turn ATTENTION/LOAD light on (flashing)
Turn ATTENTION/LOAD light on
Reset CR-510
11 (HEX)
13 (HEX)
13 14 (HEX)
08 (HEX)
ASCII
ASCII
ASCII
ASCII
XON protocol (DC1 on some ASCII tables)
XOFF protocol (DC3 on some ASCII tables)
Hard Reset (DC3 DC4 on some ASCII tables)
Backspace (BS on the ASCII table)
The Card Reader commands can be broken down into four categories: data format commands,
feed mode commands, status/specification commands, and Hexadecimal commands.
Data Format Commands
Data Format commands instruct the CR-510 as to how it should interpret the data on the cards.
Each card column consists of 12 rows. These rows were originally arranged to correspond to the
"Hollerith" code, which is a system of coding similar to the ASCII code.
Summary of Contents for TRS-80 CR-510
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Page 12: ...Figure 7 Baud Rate Switch Positions...
Page 17: ...Figure 10 Card Specifications Chart 1 3...
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Page 51: ...A 1...
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Page 55: ...B 1 Figure B1 General Purpose Card Appendix B Card Specification...
Page 56: ...B2...
Page 58: ...C2...
Page 60: ...D 2 Card Trailing Edge Card Must Be Placed Face Down In the Card Hopper Card Left Card Right...
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