Appendix B - Network Terminal RS-232 Interface Protocol Format
B-6 P/N 8040375G001
C
HELIX TECHNOLOGY CORPORATION
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TI CR
Y
OG
E
N
IC
S
Figure B-1: RS-232 Cable Connections
2 R x D <-
3 T x D ->
9
5
Shield
9 Pin Male
<- T x D 2
<- R x D 3
GND 7
25 Pin Female
On-Board Module
IBM-PCxT
CAUTION
The RS-232 cable should not
be routed with power cables and
other equipment which may generate
excessive EMI conditions.
2 R x D <-
3 T x D ->
9
5
Shield
9 Pin Male
On-Board Module
<- T x D 3
-> R x D 2
GND 5
9 Pin Female
IBM-AT
On-Board Module to IBM-AT
On-Board Module to IBM-PCXT
NOTE: Connectors should be of a metal case type and cable lengths should not exceed 40 feet.
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