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APPENDIX H
The TT command gives an operator direct control of various Brewer functions by allowing low level
commands to be sent directly from the Computer keyboard. With this feature, most useful as a
troubleshooting tool, all motors can be moved, lamps turned on, and data sampled.
This command is useful only when the Brewer and Computer are communicating, and is sent from
the Main Menu with the command, TT.
A copy of all transactions can be preserved if the print to disk has previously been turned on with
the PD command, and a printout is requested after launching TelyType command.
Command Level
A command string consists of zero or more commands separated by semicolons, optionally
followed by the A "command", and sent with 'Enter'.
Examples of TT commands:
B,2
M,1,0
R,0,7,10;O;A
When executing a command string, the Brewer executes each command set in turn. Commands
within a command set are executed concurrently. The command set is assumed to have ended
when the first command in the set has ended, even if other commands in the set are still executing.
Any commands which generate output transmit that output in accordance to the rules of the low
level protocol in effect.
Command strings terminating in the A "command" get repeated indefinitely. In the case of the
computer interface low level protocol, an ESC command is required to terminate execution; in the
case of the TTY low level protocol a break must be sent.
The following sections identify the various commands. Commands with single character opcodes
constitute the commands supported by the COSMAC based Brewers. They are augmented by a
number of commands supported only by later versions of the Brewer. These newer commands
have multicharacter opcodes and provide functions specific to newer electronics or provide more
natural commands for functions supported by the COSMAC based Brewers.
A number of the commands listed below are used only for diagnostics and are not nornally used in
day to day operations, but are included for completeness. The commnds in more common use are
marked by **.
Turn the the mercury lamp and/or the standard lamp on or off. This command requires
configuration variables.
1. ** B
Syntax
Parameters
APPENDIX H COMPUTER / BREWER INTERFACE (TELETYPE)
COMPUTER / BREWER INTERFACE
- turn on the Quartz Halogen Lamp
- move the Zenith Prism to the 0 (Lamps) position
- run the shutter from position 0 to 7 a total of 10 times,
- output the resulting counts, and
- repeat until interrupted by "HOME"
B, <mask>
The parameter <mask> takes one of four values or an error is logged:
<mask>
standard lamp
state
0
off
1
off
2
on
3
on
MKIII OPERATOR'S MANUAL
(TELETYPE)
Mercury lamp state
Off
On
Off
On
113
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