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Servicing Information
91
RS530 / RS422 Null-Modem CableShield
TransmittedData(A)
TransmittedData(B)
ReceivedData(A)
ReceivedData(B)
RequestToSend (A)
RequestToSend (B)
ClearToSend (A)
ClearToSend (B)
DCEReady(A)
DCEReady(B)
DTEReady(A)
DTEReady(B)
SignalGround
ReceivedLineSignalDetector(A)
ReceivedLineSignalDetector(B)
TransmitTiming(A)DCE So urce
TransmitTiming(B)DCE Source
ReceiverTiming(A)DCE Source
ReceiverTiming(B)DCE Source
LocalLoopback
RemoteLoopback
TransmitTiming(A)DTE Source
TransmitTiming(B)DTE Source
TestMode
ClearToSend (A)
D
B
2
5
M
A
L
E
1
2
14
3
16
4
19
5
13
6
22
20
23
7
8
10
15
12
17
9
18
21
24
11
25
D
B
2
5
M
A
L
E
1
3
16
2
14
6
22
5
13
4
19
8
10
7
20
23
24
11
17
9
18
21
15
12
25
TransmittedData(A)
ReceivedData(A)
TransmittedData(B)
ReceivedData(B)
DCEReady(A)
DCEReady(B)
ClearToSend (B)
RequestToSend (A)
RequestToSend (B)
ReceivedLineSignalDetector(A)
ReceivedLineSignalDetector(B)
DTEReady(A)
DTEReady(B)
SignalGround
TransmitTiming(A)DTE Source
TransmitTiming(B)DTE Source
LocalLoopback
RemoteLoopback
ReceiverTiming(A)DCE Source
TransmitTiming(A)DCE Source
TransmitTiming(B)DCE Source
TestMode
Shield
ReceiverTiming(B)DCE Source
Figure C-13 RS530 / RS422 Null-Modem Cable
The connecting cable must be a shielded cable.