Santec PEM-320, Operation Manual

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POLARIZATION EXTINCTION RATIO METER PEM-320
8-1
8
Communication Interfaces
CAUTION
The PEM-320 supports both GPIB and RS-232C communication protocols. This enables remote
operation of the device and integration in automated test and measurement systems. Although the two
protocols are fundamentally different the core control commands are the same.
8-1. GPIB Control
A standard GPIB delta connector is used. Connections should be made using IEEE-488 compatible
cables.
The GPIB protocol requires each device connected to the data bus to have a unique address. The PEM-320
allows addresses to be set in the range 00 to 30. The factory default setting is 01.
To enter the GPIB Address Setting Mode or to check the current GPIB address press and hold the GPIB
Local Key for two seconds. The current GPIB Address is shown in the PER Display Panel and will
flash to indicate that is can be changed. To exit the Address Setting Mode without changing the address
or delimiter settings press the GPIB Local key twice in succession. To change the address press the
Optical Power Unit Selector Key until the required address is displayed. Pressing the GPIB Local Key
a second time causes the GPIB delimiter setting shown in the Polarization Angle Display Panel to flash.
This can be similarly changed using the Optical Power Unit Selector Key. Pressing the GPIB Local
Key a third time saves the displayed values and returns control to normal operation.
When GPIB remote control is active the 'Remote LED' on the front panel will be lit. Control is returned
to the front panel by pressing the GPIB Local key on the front panel. The GPIB Local Lockout
command (LLO) can be issued to prevent operation of the front panel GPIB Local key. In Visual Basic
this command is issued using the 'Call SendLLO(0)' code. When the Local Lockout command has been
issued control can only be returned to the front panel using the GPIB Interface Clear command (IFC).
In Visual Basic this is issued as 'Call SendIFC(0)' where '0' is the GPIB interface number.
Please ensure the power to the unit is turned off before connecting or disconnecting either the GPIB
or RS-232C interfaces.