Marathon Computer UNIPRO V3.5 - Manual (Page 13)

Marathon Monitors Inc
.
Unipro 3.5 Process Control 1 Aug. 1997
UNIPRO Rear Panel
UNIPRO Electrical connections
AC Power
The UNIPRO requires 100/120/200/240 VAC at 1 AMP,
Communications
Three communications busses are at TBC and use RS-422 full or
half duplex protocol for all ports. (Refer to "Communications" in
Maintenance and Troubleshooting.) Typically, the HOST port will
connect to a host computer, the AUXILIARY BUSS to other
instruments, and the OPTOMUX PORT to OPTOMUX
I/O devices.