Test Connector
Overview
Connectors aid in testing I/O ports. The connectors take the
form of either a single plug or a port-to-port cable with some communications
connections shorted (loopedback).
Note - Connectors must be wired properly and connected firmly
for the serial port tests to work correctly. Miswired, poorly soldered,
or missing connectors can cause erroneous diagnostic error messages.
The following table depicts the pin assignments for most plugs
and cables that you can use to test a system.
Table 3 Connector Pin Assignments
|
|
|
|
|
|
|
|
|
|
Chassis/Frame Ground |
AA |
101 |
1 |
NC* |
NC* |
NC* |
1 |
None |
AA |
Transmit Data (TxDa) |
BA |
103 |
4 |
22 |
3 |
3 |
2 |
Output |
BA |
Receive Data (RxDa) |
BB |
104 |
6 |
24 |
5 |
2 |
3 |
Input |
BB |
Request To Send (RTSa) |
CA |
105 |
7 |
25 |
6 |
7 |
4 |
Output |
CA |
Clear To Send (CTSa) |
CB |
106 |
9 |
27 |
2 |
8 |
5 |
Input |
CB |
Data Set Ready (DSRa) |
CC |
107 |
11 |
29 |
NC* |
6 |
6 |
Input/output |
CC |
Signal Ground (SG) |
AB |
102 |
9 |
NC* |
4 |
5 |
7 |
None |
AB |
Data Carrier Detect (DCDa) |
CF |
109 |
13 |
31 |
7 |
1 |
8 |
Input |
CF |
Transmit Clock In (TRxCa) |
DB |
114 |
5 |
23 |
NC* |
NC* |
15 |
Input |
DB |
Receive Clock In (RTxCa) |
DD |
115 |
8 |
26 |
8 |
NC* |
17 |
Input |
DD |
Data Terminal Ready (DTRa) |
CD |
108 |
12 |
30 |
1 |
4 |
20 |
Output |
CD |
External Clock Out (TRxCa) |
DA |
113 |
17 |
35 |
NC* |
NC* |
24 |
Output |
DA |
Secondary Data Carrier Detect (DCDb) |
SCF |
122 |
NC* |
NC* |
NC* |
NC* |
12 |
Input |
SCF |
Secondary Clear to Send (CTSb) |
SCB |
121 |
NC* |
NC* |
NC* |
NC* |
13 |
Input |
SCB |
Secondary Transmit Data (TxDb) |
SBA |
118 |
NC* |
NC* |
NC* |
NC* |
14 |
Output |
SBA |
Secondary Receive Data (RxDb) |
SBB |
119 |
NC* |
NC* |
NC* |
NC* |
16 |
Input |
SBB |
Secondary Request to Send (RTSb) |
SCA |
120 |
NC* |
NC* |
NC* |
NC* |
19 |
Output |
SCA |
|
*NC = No Connection