Moxa Technologies ioThinx 4500 45ML-5401, User Manual, Page: 13 / 16

ioThinx 4500 (45ML) Module Series Hardware Installation
3-2
Module Specifications
Terminal Blocks
Wire range: 18 to 24 AWG
Wire strip length: 9 to 10 mm
Unit: mm (in.)
45ML-5401
Pin Assignment
The following tables shows the 45ML-5401 pin assignments.
Pin RS-232 RS-422 RS-485 Pin RS-232 RS-422 RS-485
1 GND GND GND 11 GND GND GND
Port
1
2 TxD1 TxD1+ Data1+
Port
3
12 TxD3 TxD3+ Data3+
3 RxD1 TxD1- Data1- 13 RxD3 TxD3- Data3-
4 RTS1 RxD1+ – 14 RTS3 RxD3+ –
5 CTS1 RxD1- – 15 CTS3 RxD3- –
Port
2
6 TxD2 TxD2+ Data2+
Port
4
16 TxD4 TxD4+ Data4+
7 RxD2 TxD2- Data2- 17 RxD4 TxD4- Data4-
8 RTS2 RxD2+ – 18 RTS4 RxD4+ –
9 CTS2 RxD2- – 19 CTS4 RxD4- –
10 GND GND GND 20 GND GND GND
Setting Up Termination Resistors
When setting up your RS-485 and RS-422 networks for long-distance communication, you should use
termination resistors to prevent signal reflections. The following figures illustrate how to properly configure
termination for a 2-wire RS-485 network, and an RS-422 network.
The 45ML-5401 Series comes with 10 kilo-ohm pull-high/low resistors built in. You will usually only need to
install termination resistors (typically 120 Ω) on the first and last devices on your network.