AR 10037990, Operating And Service Manual, Page: 43 / 54

Model 250T6G18
Rev A 23
Table 3-8. *STB?; Response Codes
(The command *STB?; causes the TWTA to send a string containing an operational state code consisting of 2
ASCII characters representing hex digits. The response is in the form "STATUS:
[x][y][eol] " where the hex
values of [x] and [y] are formed as shown below)
y bit Meaning
0 (LSB) Power status; always 1(power on)
1 Standby status; 0 if not in standby, 1 if in standby
2 Operate status; 0 if not in operate, 1 if in operate
3 (MSB) Fault status; 0 if no fault, 1 if fault exists
x bit Meaning
4 (LSB) Mode switch; always 1 (reset)
5 Blank switch; always 1 (off)
6 Blank status; always 0 (off)
7 (MSB) Not used; always 0
Table 3-9. Catalog of Heater Auto Off Time Delay Codes
Argument Meaning
0 0.5 hour heater auto off time delay
1 1.0 hour heater auto off time delay
2 1.5 hour heater auto off time delay
3 2.0 hour heater auto off time delay
4 2.5 hour heater auto off time delay
5 3.0 hour heater auto off time delay
Command syntax is in this form:
<command mnemonic> <parameter> <carriage return>
where;
<command mnemonic> consists of one of any valid command found in Table 3.
<parameter> (as applicable) consists of one ASCII "space" character followed by a number.
<carriage return> consists of an ASCII carriage return.
All commands are case sensitive.
The system will return parameter values, fault codes, and status codes regardless of whether remote is enabled.
The parameter value is returned as a string of 20 characters or less, consisting of a label,"=", and a value. For
example, outputting the command RDEF to the TWTA would result in the TWTA sending back the string
"Ef=6.03" (assuming the heater voltage is 6.03 volts). Units are usually not returned; see table 3 for the units.
If remote is not enabled, set commands and commands to the system logic (i. e., OPERATE;, STANDBY;, or
RESET;) will not be accepted.
It is recommended that the RDSTAT command be used to provide the host program with a report on how a
command was processed.
A small sample program that can send commands and receive the strings returned by the TWTA is included in
Section 5.3. It is written in Hewlett-Packard's "Rocky Mountain" BASIC. The program assumes that the IEEE-
488 bus is at address 7 and that the address of the TWTA is 01.