Manhattan IDATA RS232C User guide

Ver. 1.00

RS-232 to RS-422/485 Converter

User Manual

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respective owners.

Contents:

Chapter 1: Introduction ...................................................... 3

1.1 Product Introduction .................................................... 3

1.2 Features ........................................................................ 3

1.3 Package Contents ......................................................... 4

Chapter 2: Getting Started ................................................. 4

2.1 Hardware Layout ......................................................... 4

2.2 Pin Assignment ............................................................ 6

2.3 Jumper Settings ............................................................ 8

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Chapter 1: Introduction

1.1 Product Introduction

This RS-232 to RS-422/485 Converter is bi-directional connector
converter between RS-232 and RS-422/485; it is mainly used for
communication between main controller machines or Peripherals, it
achieve request-response communication between multi-machines, it is
mainly used for the field of electricity, industrial automatic control, IC
card billing system, such as one card solution, access control system,
parking system, and so on.

1.2 Features

 RS-232 to RS-422 conversion with RTS/CTS support
 RS-232 to 2/4-wire RS-485 conversion
 Wall mount design
 PWR, Tx and Rx LEDs
 Supports baud rate up to 1Mbps and Auto Baud Rate Detection
 RS-422 and RS-485 auto detect and switching

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 ±15KV ESD protection on all signal pins

1.3 Package Contents

 1 x RS-232 to RS-422/485 Converter
 1 x User Manual
 1 x 5V/1A Power Adapter

Chapter 2: Getting Started

2.1 Hardware Layout

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 Status LED:

1. PWR – Green, Light when the power is on

2. Rx – Yellow, Blink when serial data received

3. Tx – Yellow, Blink when serial data sent

 DIP Switch: RS-422/485 Mode Selector

This RS-232 to RS-422/485 Converter equips independent DIP switch
for each serial port.

1). Auto RS-422/485 (Default)
This COM can automatically detect the state of RS-422 full duplex or
RS-485 half duplex and control the data transmitting and receiving
wires at the same port.

SW1

1: On; 2:Off

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2). RS-422 (4-Wire RS-485)
This COM port forces to run RS-422 full duplex mode.

SW1

1: Off; 2:On

2.2 Pin Assignment

The RS-232 side of the RS-232 to RS-422/485 Converter is a female
DB9 and pinouts are standard to all PC serial COM Ports (Pin 2: RxD;
Pin 3: TxD; Pin 5: GND; Pin 7: RTS; Pin 8: CTS)

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Female DB9 Connector: RS-232 Side

Pin Transmission Signals

RS-422 4-Wire RS-485 2-Wire RS-485
1 Tx- Tx- D­2 Tx+ Tx+ D+
3 Rx+ Rx+
4 Rx- Rx-
5 GND GND GND
6 RTS- RTS­7 RTS+ RTS+
8 CTS+ CTS+
9 CTS- CTS-

Male DB9: RS-422/485 Side

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2.3 Jumper Settings

This RS-232 to RS-422/485 Converter equips independent TX&RX
and RTS&CTS termination resistors for RS-422/485 connector. User
can modify the jumper setting (short the pins) to avoid impedance
mismatched problem when operate under Multi-drop transmission.
Resistors should be added near the receiving side. Note: Stands for
termination resistor near the receiving side.

Factory default jumper setting is Short (enable 120 ohms termination
resistors across the two wires)

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