3.b CONFIGURING THROUGH THE RS-232/485 INTERFACE
When proper RS-232/485 communications have been established with an exter-
nal computer or terminal, it is possible for a 3500 Series instrument to receive
and respond to SETUP COMMANDS issued directly to it through this interface.
There is a specific SETUP COMMAND for each of the front-panel button proce-
dures described in the previous section, with the exception of the node-number
assignment (see the NODE (NOD) command, below). These commands are list-
ed below. For a full discussion of "Command and Response Syntax," along with a
list of all valid mnemonic commands, see Appendix B of this manual.
Except for NODE (NOD), each of the following SETUP COMMANDS can take a
"WRITE" or "READ" form. Only the "WRITE" form is given here. Again, for full
details, see Appendix B. In the following command expressions, [CMT] means
"COMMAND TERMINATOR" (that is, the INPUT TERMINATOR character which the
unit has been set to recognize—see the procedure for setting the INPUT TERMI-
NATOR via the COM button in Section 3.a.3, above).
IMPORTANT: WHEN CONFIGURING YOUR UNIT "REMOTELY" THROUGH THE
RS-232/485 INTERFACE, DON'T FORGET TO ISSUE A COMMAND OF
SAV=ON [CMT]
WHEN YOU'RE FINISHED. THIS COMMAND WILL SAVE THE EXISTING SETUP
CONFIGURATION TO NONVOLATILE EEPROM.* IF NOT SAVED, THE SETUP VAL-
UES YOU HAVE JUST ENTERED WILL BE LOST ON INTERRUPTION OF POWER.
3.b.1 SECURITY CODE
SECURITY CODE (SCD): SCD=c [CMT]
Sets the security code to "c" (where 0 ≤ c ≤ 98).
3.b.2 COMMUNICATIONS PARAMETERS
BAUD RATE (BAU): BAU=b,s,d,p [CMT]
Sets the baud rate ("b"), number of stop bits ("s"), number of data bits ("d"),
and parity ("p"). Refer to Appendix B for the values these variables can take.
NODE (NOD): NOD [CMT]
Reads the node number of the currently "open" node (for "opening" a node,
see Section 5.a.3). THERE IS NO "WRITE" FORM OF THIS COMMAND; A
NODE NUMBER CAN BE ASSIGNED TO A UNIT ONLY THROUGH THE
FRONT-PANEL COM BUTTON SEQUENCE DESCRIBED IN SECTION 3.a.3.
3.20
3
SETUP: INSTRUMENT CONFIGURATION
3.b CONFIGURING THROUGH THE RS-232/485 INTERFACE
* Note that an interrogation of the form SAV [CMT] will return "ON" or "OFF," depending on
whether or not the setup is in the process of being automatically saved as a result of pressing
the front-panel SETUP button (Section 3.a.1). Note too that the SETUP COMMAND SAV=OFF
[CMT] has no effect.
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