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
P
o
rt
2
RS
-2
3
2
RS
-4
2
2
E7
E8
Po
rt
1
R
S
-2
32
R
S
-4
22
RS-422/485
E1
E2
Po
rt
4
RS
-2
3
2
RS
-4
2
2
E3
E4
Po
rt
3
RS
-2
3
2
RS
-4
2
2
RS-232
E5
E6
P
o
rt
2
RS
-2
3
2
RS
-4
2
2
E7
E8
Po
rt
1
R
S
-2
32
R
S
-4
22
E1
E2
Po
rt
4
RS
-2
3
2
RS
-4
2
2
E3
E4
Po
rt
3
RS
-2
3
2
RS
-4
2
2
Figure 6 - Headers E1 - E4, Electrical Interface Selection
CyberResearch, Inc
.
5
25 Business Park Drive
P: (203) 643-5000; F: (203) 643-5001
Branford, CT USA
www.cyberresearch.com
