Thorlabs FW102C Filter Wheel

Communications

Serial settings (baud rate, parity) can, if required, be changed via the manufacturer’s software. Ensure the IOC matches the physical device. Device communicates using a straightforward ASCII protocol with carriage-return terminators (\r).

IOC

The IOC is very straightforward, incorporating simple get and put records. Communication is serial and utilises the EPICS StreamDevice protocol. A summary of the commands is given below:

Command	Syntax	Description
Get ID	*idn?	Returns the model number and firmware version
Set Position	pos=n	Moves the wheel to filter position n
Get Position	pos?	Position Query
Set Position Count	pcount=n	Sets the wheel type where n is 6 or 12
Get Position Count	pcount?	Returns the wheel type
Set Trigger Mode	trig=0	Sets the external trigger to the input mode
	trig=1	Sets the external trigger to the output mode
Get Trigger Mode	trig?	Returns the trigger mode
Set Speed Mode	speed=0	Sets the move profile to slow speed
	speed=1	Sets the move profile to high speed
Get Speed Mode	speed?	Returns the move profile mode
Set Sensor Mode	sensors=0	Sensors turn off when wheel is idle to eliminate stray light
	sensors=1	Sensors remain active
Get Sensor Mode	sensors?	Returns the sensor mode
Set Baud Rate	baud=0	Sets the baud rate to 9600
	baud=1	Sets the baud rate to 115200
Get Baud Rate	baud?	Returns the baud rate where 0 = 9600 and 1 = 115200
Save Settings	save	This will save all the settings as default on power up

Notes:

• Default framing is 115.2 kbaud, 8 data bits, 1 stop bit, no parity, no flow control.