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Appendix A
REMOTE INTERFACE COMMANDS
A.1
INTRODUCTION
This appendix describes using the remote interface to control and monitor digital controller op-
eration. There are three remote interfaces available: RS-232, RS-422, and IEEE-488. All of the
interfaces use the same communications protocol as described in this appendix.
All communications proceed using the "send and wait" protocol method; that is, a command is
sent to the ACU via the chosen interface, and the sending device must wait until a response has
been received before issuing another command. The ACU will only respond to commands re-
ceived, it does not spontaneously issue any messages. Response time to messages varies with the
message type; however, response times will generally be much less than 100 milliseconds.
All interface transactions employ the ASCII character set. Nonprinting ASCII characters are re-
ferred to in the text by enclosing the ASCII name for the character in angle brackets (see the ta-
ble below).
The following conventions are used in this description:
[ ]
(square brackets) enclose items that are optional.
...
(ellipsis) indicate that the preceding item may be repeated zero or more
times.
<cr> indicates the carriage return character (0D hex).
<lf>
indicates the line feed character (0A hex).
<ack> indicates acknowledge character (06 hex).
<nak> indicates the not-acknowledge character (15 hex).
Upper-case letters in the command format indicate required characters; lower-case indicate vari-
able input strings.
Each message to the ACU starts with the '@' character. The next character is the PWB ID. All
commands to the Servo PWB begin with @8. All commands to the operator remote interface
(ORI) PWB begin with @0. Each message is terminated with the <cr><lf> characters.
3862 Autotrack Controller
A-1
REMOTE INTERFACE COMMANDS
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