Tegam 1750 - RS232 Hierarchy of Commands; Table 5.4 -RS232 Status Command Summary

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5-12
PROGRAMMING AND INTERFACING
Status – U0, U1, U2, U3, U4, U5, U6, U7
Immediate Commands – I, G, T, E, X, There are a total of 5 immediate commands used via RS232.
“I” – Initializes the 1750 and executes a device clear. When the I command is used the 1750 returns
to its original factory default settings.
“G” – This command gives the unit a trigger to allow the unit to initiate a reading. For example, if the
unit had been previously set for “T4”, Fast Continuous on “G” command, that is, “T4X” the instrument
will begin to take readings after a “GX” command follows.
“E” – Return the generated message from the 1750 output buffer to the controller. This is because the
RS232 interface is not set up for full duplex communications, (handshaking) like the GPIB interface.
“X” – Force execution of preceding commands
Self-Test – Q1X – The Q1 command instructs the 1750 to perform a self-test and the trailing X
instructs the instrument to execute the self-test. If the 1750 passes the Self-Test then the message
“SelfTest PASS” is stored in the output buffer so that the next read instruction will call the message.
If the user is communicating with the instrument with a serial emulator such as Windows
HyperTerminal, an “E” command is also needed to return the self test results to the computer.
Status Commands – Reading the instrument status is usually performed after executing one or more
device dependent commands. The status request function, UnX, (where n=0-7) will generate the
respective responses to the RS232 output buffer of the 1750. The “E” command will return the status
message to the controller. If no status query was entered prior to the “E” command, then the latest
reading of the 1750 will be received by the controller.
Table 5.4: RS232 Status Command Summary
RS232 Hierarchy of Commands
Query
Command
Return Value
(example)
Description
Additional Notes
Machine Status
U0XE
C0D111F0M63P0R05S0T0B0Y0
Active Device Dependent Command Settings
Error Status
U1XE
Error#, where #:
No errors = 000
self test fail = 008
illegal command = 016
conflict = 032
illegal command option = 064
Any time that an error occurs in a program
line, all of the commands in that line up to
the next “X” are disregarded.
To clear an error send U1X then send the
command to read per your command string.
Both actions are required in order to clear the
error bit in the control byte.
Revision Level
U2XE
Tegam 1750 D02.20 Apr 26,2000
Returns the software revision level of the
1750
High Limit
U3XE
10000
Returns the high comparator limit in counts
Low Limit
U4XE
00500
Returns the low comparator limit in counts
Nominal
U5XE
12345
Returns the nominal % comparator value in
counts
% High Limit
U6XE
10.00
Returns the high % comparator limit in %
% Low Limit
U7XE
10.00
Returns the low % comparator limit in
counts.
Self Test Response
Q1XE
“Self test PASS”
Verification of self-test successful – no
reported errors.