User`s manual

CyberResearch
®
Serial Communications COMHP 7404/-D25
Electrical Interface Selection
Each port on the COMHP 7404 has the ability to be used in either RS-232 or RS-422/485. This is selectable via eight 24 pin
DIP-shunts at E1-E8. Please use the following illustration to aid in the configuration of your electrical interface.
E5
E6
Port 2
RS-232 RS-422
E7
E8
Port 1
RS-232 RS-422
RS-422/485
E1
E2
Port 4
RS-232 RS-422
E3
E4
Port 3
RS-232 RS-422
RS-232
E5
E6
Port 2
RS-232 RS-422
E7
E8
Port 1
RS-232 RS-422
E1
E2
Port 4
RS-232 RS-422
E3
E4
Port 3
RS-232 RS-422
Figure 6 - Headers E1 - E4, Electrical Interface Selection
CyberResearch, Inc. 5
25 Business Park Drive P: [phone]; F: [phone]
Branford, CT USA www.cyberresearch.com