Sets exposure time.
2=to: 2!:}Format: <headnumber> <exposuretime> SEX
2=to: 2!:}Example: 1 10000 SEX
2=to: 2!:}Units: Milliseconds.
2=to: 2!:}Comments: Local command to set exposure time. The first parameter is the CCD head number, and is 1 or 2. This command currently only works from the Network vocabulary, invoked by typing NETWORK.