Figure 15 POS-002 response to discontinuous change in input polarization state
(response threshold larger than default setting)
For high sensitivity applications with clean feedback signals, the threshold should
generally be left at 0 (default value).
4.4.3 RS-232
troubleshooting
If a problem occurs during RS-232 control, please check the following:
1.
Pin connections; make sure that the correct pins on the POS-002 are
connected to the corresponding pins on the computer RS-232 port.
2.
Verify active Comm Port (COM1, COM2, etc.);
3.
Verify Comm Port settings: 8 data bits, 1 stop bit, no parity bits;
4.
Check baud rate: must be 9600 bps;
5.
Check commands: command should begin with “*” and end with “#” or “?””
4.4.4 LabView control program
The command list in Table 2 can be used to write control programs for the Pos-002.
General Photonics provides a sample control program that can be used as a base for
customization by the user. The program is written in LabView. The source code (vi files)
can be opened and edited using LabView 2012 SP1 or above.
For users who do not need to customize the control program or do not have LabView
installed on the control computer, General Photonics also provides an executable version
of the program for added convenience.
Document #: GP-UM-POS-002-21
Page 22 of 30
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