New (to me) HP 3421A DA/C Unit, some questions

[Sylvain Cote]

(05-12-2017 03:28 PM)4ster Wrote:  Can someone familiar with the module explain the function of the CMD key on both the Front Panel and Data Logger overlays?
The manual is mute about its intended use as far as I can determine.

Hello Steve,

44468A DATA ACQUISITION/CONTROL ROM PAC Page 58
The CMD commands locate the first type 5 instrument connected to the interface, selects it and send it information of the following nature:

Code:

CMD    XROM:21,47  Contents of 41C/CV ALPHA Register.
CMDX   XROM:21,48  ALPHA Register followed by the absolute value of the integer portion of the X-Register.
CMDXY  XROM:21,49  ALPHA Register, X-Register (as with CMDX) a "comma", the absolute value of the integer portion of the Y-Register.

After the command is sent, the 41C/CV will check the instruments Status Register for a syntax error.

Sylvain