Santec PEM-340 - Control Commands

Polarization Extinction Ratio Meter PEM-340
9-3
The delimiter for RS-232C communication is set in the factory as CR (carriage return). This
can be changed when power to the PEM-340 is initially switched on. For an explanation of this
procedure please see Section 8-1 Power On.
9-3. Control Commands
The following table lists the communication conditions that should be set to enable
communication through the RS-232C interface of the PEM-340.
The table below lists the control commands specic to the PEM-340 which can be implemented
using either the GPIB or RS-232C protocols. A command consists of two letters and may
be written in either upper or lower case. As appropriate, the commands can be issued with
or without a numerical sufx. A delimiter must be attached to the end of each command to
ensure correct execution and termination of each command line. The delimiter required for
GPIB operation is CR+LF. The delimiter required for RS-232C operation can be CR, LF or
CR+LF. This delimiter is set in the factory to CR and this can be changed during the ‘Power
On’ procedure; for details see Section 8-1 Power On.
To read data from the PEM-340 it is rst necessary to set the output parameter to the required
data parameter. When subsequent read commands are issued, the data corresponding to the
set parameter is read. In RS-232C communication “echo-back” is used to verify correct
communications. Once the output parameter has been set, the DI command is used to request
data from the unit. In both GPIB and RS-232C protocols when a command that cannot be
interpreted is issued, the PEM-340 outputs “NR” to the next data request. This output stops
when a valid command is received.
Communication Method Full Duplex
Baud rate 9600 bps
Data Length 8 bit
Stop Bit 1 bit
Parity None
Flow Control None