ETT 771
BUILD-IN TOUCH TERMINAL
Page 12
15.07.2020
X3:
COM 1 (D-Sub)
X4:
CAN 1 (6-pin Weidmüller)
X5:
COM 3 (6-pin Weidmüller)
The RS485 / Modbus interface is protected against external
voltages of ±30 V DC, there is no function for an error voltage!
The termination since HW version 1.10 is made
with a 120
Ω resistor on connector X5 between
RS485/Modbus-A and RS485/Modbus-B.
Pin
Function RS232
1
DCD
2
Rx
3
Tx
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Pin
Function
1
CAN A (LOW)
2
CAN B (High)
3
CAN A (LOW)
4
CAN B (High)
5
CAN GND
6
n.c.
Pin
Function RS485/ModBus
1
RS485/Modbus-A
2
RS485/Modbus-B
3
RS485/Modbus-A
4
RS485/Modbus-B
5
RS485/Modbus-GND
6
n.c.