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6
CU111 connection
6.Computer Link (RS485) interface
(1)Computer Link (RS485) signal name and pin assignment
(2)Computer Link (RS485) interface connection
Short between RXA(Pin No.3) and TRM(Pin No.4) for termination of one-to-one configuration
at CU111. Refer to the next page.
Note
¬ Use the shielded twisted-paired cable for noise immunity and ground the cable shield at
one end.
- Connect SG (Signal Ground) each other.
® The adapter does not have the frame ground (FG) terminal, so please ground directly.
¯ Please make the program transmitting again.
Pin No. Signal Name Function
1 TXA
CU111→RS485 (In phase signal)
2 TXB
CU111→RS485 (Reverse signal)
3 RXA
CU111←RS485 (In phase signal)
4 TRM Termination
5 RXB
CU111←RS485 (Reverse signal)
6 SG Signal Ground
TXA
1
TXB
2
RXA
3
TRM
4
RXB
5
SG
6
R
Sheilded
twisted-paired cable
RS232C/RS485
Multi-drop adapter
CU111
Host Equipment
RS485 Interface
1
TXA RXA
RXDTXD
2
TXB
RXB
3
TXARXA
4
TXDRXD
TRM
5
TXB
RXB
6
SGSG