Pin Assignments - 3Com NETBUILDER II Installation Manual

DTE-to-DCE Adapter

Pin Assignments

Table 1-2 HSS RS-232 3-Port Module Connector and Cable Pin Assignments
RS-232 Port
Pinout
A B C Signal I/O
15 32 48 RI input
14 31 47 TM input
7 21 38 SG -
4 24 38 SG -
CAUTION: All interconnecting cables must be properly shielded to reduce the potential
for interference. Only cables from 3Com are guaranteed to meet emissions standards. If
other cables are used, 3Com cannot guarantee compliance.
Figure 1-5 lists the pin assignments for the DTE-to-DCE adapter.
NB-II
Signal Pin No.
Shield 1
TXD 2
RXD 3
RTS 4
CTS 5
DSR 6
S.G. 7
DCD 8
RXC 17
LL 18
RL 21
RI 22
TXCE 24
DTR 20
Figure 1-5 Pin Assignments for the DTE-to-DCE Adapter
Signal Description
Ring Indicate
Test Mode
Signal Ground
Signal Ground
To DTE
Pin No. Signal
1
Shield
2
TXD
3
RXD
4
RTS
5
CTS
6
DSR
7
S.G.
8
DCD
15
TXC
17
RXC
20
DTR
Cabling the Module 1-11
RS-232 Cable
Pinout
(25 pin male)
22
25
7