**CIGAL Reference Manual, Chapter 4 (Variables): sw1**
===== Sw1 -- Control peripheral relay switching device via printer port =====
**usage: sw1 = value ; switch number 1**\\
**or: sw2 = value ; switch number 2**\\
**or: sw3 = value ; switch number 3**

SW1, SW2, and SW3 are device dependent number variables, designed to control relay
switches connected via the printer port.  This command is currently only available
on the time-lapse microscope system at University College London.

The VALUE of the switches can be either:
           0 -- switch OFF
           1 -- switch ON

**See Also:**\\
[[jvs:cigal|CIGAL Home]], 
[[jvs:cigal:manual|CIGAL Manual]], 
[[jvs:cigal:manual:chapter4|Variables List]], 
[[jvs:cigal:manual:help|Manual Help]]