Serial And I/O Port Interfaces - weiland wienet LAN ER300-GLOBAL User Manual

5.3

Serial and I/O port interfaces

The pins of the serial interfaces RS232 and RS485 are connected, together with the I/O interface,
physically to the 10-pin terminal on the left side of the device. None of the 3 interfaces are isolated
from the router. The pin assignment of this plug connection is described in Figure 11 and in Table 9
and Table 10.
Figure 11: Serial and I/O connection
Table 9: Connection of RS485
Pen Signal mark
1 D (+)
2 D (-)
3 GND
NOTICE We recommend connecting a terminal resistor outside the router. Without a terminal resistor, signal
reflections from the non-terminated end of the cable can cause data corruption. Terminal resistors
also reduce sensitivity to electrical noise due to the lower impedance.
Table 10: Connection of I/O
Pen Signal mark
4 BIN
5 BOUT
Table 11: Connection of RS232
Pen Signal mark
6 RXD
7 CTS
8 GND
9 RTS
10 TXD
The serial interfaces are not electrically isolated from the router.
NOTICE
Wieland Electric GmbH | BA001314 | 06/2023 (Rev. A)
Hardware Functionality
Description
In/Out
In/Out
Ground
Description
Binary IN
Binary OUT
Description
Received Data
Clear to Send
Ground
Request to Send
Transmit Data
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