User`s manual

Moxa C Programmable RTU Controllers Getting Started

2-6

Power Terminal Block for ioPAC 8020-C Series

Connecting to a Serial Device

The RTU controller is equipped with two 3-in-1 serial ports that support RS-232/422/485, making it more

convenient to connect field serial devices. The pin assignment is shown below:

Pin RS-232 RS-422

4W RS-485

2W RS-485

1 DCD TxD-(A) –

2 RXD TxD+(B) –

3 TXD RxD+(B) Data+(B)

4 DTR RxD-(A) Data-(A)

5 GND GND GND

6 DSR – –

7 RTS – –

8 CTS – –

9 RI – –

NOTE

After connecting the RTU

controller to the power supply, it will take a

bout 30 to 60 seconds for the operating

system to boot up. The green Ready LED will not turn on until the operating system is ready.

ATTENTION

This product is intended to be supplied by a Listed Power Unit with output marked “LPS” and rated for 12

VDC,

1.2A (minimum requirements)