Command Strings - Motorola R-2001A Service Manual

22-23. The following are examples of correct data fields for the value 12.34:
0.1234 E+2
+12.34
22-24. Command Strings. A command string consists of either a single command or multiple commands in
succession with or without embedded spaces. A command string must be terminated with a carriage return
and a line feed character.
22-25. Command Types. Eachcommand isoneofthreebasictypes,controlselects(C),dataentry(D),and
output requests (0). Type information for each command is listed in table 22-3.
22-26. Control Selects. Control select commands select front panel switch settings. Some of these
commands do not require accompanying data, such as toggle switch commands.
22-27. Data Entry. Data entry commands replace manual entry of data through the keyboard. All of these
commands require data in the data field.
22-28. Output Requests. Output request commands allow data that is normally displayed on the CRT to be
transferred to the controller. Accompanying data is not required with output requests. The data limits and units
listed in table 22-3 for these commands refer to the return data. Output request commands cause the analyzer
to go to the proper display, function, and mode to acquire the designated reading. These states are listed in
table 22-3. The measurement however, is not made until a trigger command 'T' has been sent from the
controller. The trigger command causes the measurement to be made and the data held for transmission to the
controller. Then when the controller addresses the analyzer as a talker the data is output to the controller. A
reading can be retaken for any number of triggers without repeating the output request. The request is lost
however, when any command changing the display, function, or mode is sent.
22-29. Trigger Command. The trigger command is the exception to the two character command prefix.
This command is simply the letter T' usually sent immediately following the output request command. If no
output request is pending, the trigger command is ignored.
22-30. Return Data. The data returned from the analyzer is formatted similar to the control data as shown:
DATA SIGN
The data is always returned in this format with a single exception. Data for the "RP", signal present, command
is returned as a single digit having a value of "0" or "1".
22-31. Data Sign. A + or - character indicates the sign of the return data.
22-32. Data Value. The data value is 1 to 5 digits in length with leading zero supression and no decimal
point.
22-33. Exponent and Exponent Sign. The letter 'E' followed by a '-' character is always transmitted with
return data.
+0.1234 E2
12.34 E
± n
DATA VALUE EXPONENT SIGN EXPONENT MAGNITUDE
22-7
1234 E-2
+1234 E-2
E -n
1234. E-2
12.34 EO