Programming
EPM2000/EPM2000e Reference Guide
31
PROGRAMMING
CONNECTION METHODS
The EPM2000 has been designed to use one computer interface at a time. Before attempting to
communicate with the EPM2000 via either the RS-232 interface or the IEEE-488 interface, be sure
the interface has been activated (see Operation -- Settings). Verify that all computer host
communication settings match the instrument settings (IEEE-488 address, RS-232 baud rate, etc.).
The EPM2000 will only transmit in response to a query command. It will not respond to set
commands. For example, the EPM2000 will transmit a response to ch a stat bat ?, but not to ch
a stat bat 100
.
The EPM2000 activates the
annunciator and disables the front panel controls while it processes
a remote command. During IEEE-488 communication, the EPM2000 stays in this mode. Return the
EPM2000 to local control by sending a *RST to the instrument or a loc command to the IEEE-488
bus. During serial communication, the EPM2000 returns to local control after completing the remote
command.
COMMANDS
Commands will function as described with either the RS-232 or IEEE-488 interface.
If the EPM2000 receives a command it does not know or cannot process, no action will occur, unless
IEEE-488 Communication Error reporting is activated, in which case, the instrument will reply with
the error message: Unrecognized SCPI command: <
invalid command
> ?.
Although capitalization indicates a required substring of the command, command case isn't relevant.
Commands can be separated by a space, a colon (:), or a tab. Channel-specific commands (all
commands beginning with CH) can specify channels A, B, or ALL. If no channel is specified, the
EPM2000 applies the command to Channel A.
Command parameters separated by a vertical slash are exclusive choices. For example, CHannel A
UNITS <?|VOLts|JOUles| WATts|HZ> means that ch a units vol is a valid command or ch
a units jou, but not ch a units vol jou. Command parameters separated by a comma are
non-exclusive choices. For example, CHannel A STATistics SEND <AVG,DEV,MIN,MAX>
means that ch a stat send avg is valid, as is ch a stat send avg min max.
The EPM2000 will not buffer commands, so commands received while the EPM2000 is processing a
previous command will be ignored. 300 ms is enough time for the EPM2000 to recover from most
commands.
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