RS530 Null-Modem Cable Configuration
Shield
TransmittedData (A)
TransmittedData (B)
ReceivedData (A)
ReceivedData (B)
Request ToSend (A)
Request ToSend (B)
Clear ToSend (A)
Clear ToSend (B)
DCEReady ( A)
DCEReady ( B)
DTE Ready(A)
DTE Ready(B)
Signal Ground
Received Line Signal Detector (A)
Received Line Signal Detector (B)
TransmitTiming (A) DCE Source
TransmitTiming (B) DCE Source
ReceiverTiming (A) DCE Source
ReceiverTiming (B) DCE Source
Local Loopback
RemoteLoopback
TransmitTiming (A) DTE Source
TransmitTiming (B) DTE Source
TestMode
ClearTo Send (A)
DB25M
A
LE
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
DB25M
A
LE
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)
ClearTo Send (B)
RequestTo Send (A)
RequestTo Send (B)
Received Line Signal Detector (A)
Received Line Signal Detector (B)
DTEReady (A)
DTEReady (B)
Signal Ground
TransmitTiming (A) DTE Source
TransmitTiming (B) DTE Source
Local Loopback
RemoteLoopback
ReceiverTiming (A) DCE Source
TransmitTiming (A) DCE Source
TransmitTiming (B) DCE Source
TestMode
Shield
ReceiverTiming (B) DCE Source
Figure D-11 RS530 Null-Modem Cable
The connecting cable must be a shielded cable.
Circuits which are paired (contain an (A) and (B) reference) should be connected to
twisted pairs within the connecting cable.