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The 61“ Dome Slit Controller is a a controllino that uses NG Protocol for its network and serial command syntax. The serial communication is done via the USB port and the NP protocol does not need (in fact it cant have) the obsid or sysid. So each command should start with COMMAND or REQUEST.
OBSID = BIG61 SYSID = DOMESLIT
BIG61 DOMESLIT 123 REQUEST OPEN\n
Open the dome. The response should be OK or an error message
BIG61 DOMESLIT 123 REQUEST CLOSE\n
Open the dome. The response should be OK or an error message