Copyright By ATC Technology Co., Ltd 2001-2010 VER 1.31 (Edited by Grid Connect)

Model ATC-101

RS-232 to RS-422 Interface Converter

User's Manual

1.0 General Description

The Model ATC-101 is a port-power RS-232 to

RS-422 interface converter. The Model ATC-101 has a DB9 Female connector for the RS-232 interface. The RS-422 side has a DB9 Male connector for the differential input and output interface. A 6-screw terminal connector adapter is also provided.

MODEL ATC-101 can convert the TD and RD signals of RS-232 into balanced full-duplex RS-422 signals.

2.0 Specifications

2.1 Interface : Conforms to EIA RS-232C and

RS-422 standards

2.2 Connectors and signals

The MODEL ATC-101 has a DB-9 female connector on the RS-232 side. The RS422 side has a DB9 Male connector. A 6-screw terminal connector adapter is also provided.

RS-232 Side:

Connector: DB-9 Female Signals: Use Pins 3 (TD) and 2 (RD). Pins 7 (RTS) and 8 (CTS) are tied together. Pins 4 (DTR), 6 (DSR), and 1 (CD) are tied together.

RS-422 Side:

DB9 Male Connector:

Pin1 (T-), Pin2 (T+), Pin3 (R+), Pin4 (R-)

Pin 5 (GND), Pin 6 (+5VDC)

6 position terminal block: +5V, GND, T+, T-, R+, R-

Signals: Full-duplex 4-wire operation only. Driver and Receiver are enabled all the time.

2.3 Transmission : Asynchronous full duplex over

4 wires (two twisted pairs)

2.4 Data Rate : 300 to 115.2 KBPS, up to 4,000 feet at 19,200 BPS.

2.5 Operating Distance

Data Rate (KBPS): 19.2, 9.6, 4.8, 2.4

Maximum Distance (feet): 4000, 6000, 8000, 10000

(using 24 AWG wire)

2.6 Power

MODEL ATC-101 is powered from the RS-232 data

TD or handshake lines. It will try to get its power from RTS or DTR (at least +5.5V or -5.5V in the quiescent state). If there are no RS-232 control signals (DTR or RTS) available, MODEL ATC-101 will get power from the data input TD pin (at least

-5.5V in the quiescent state). For this kind of power stealing device, sufficient power is needed to operate the device. If there are no hand- shake lines available and the TD signal can not drive MODEL ATC-101, then an external

5VDC/40mA power supply can be connected to two terminals on the RS-422 connector between terminals +5VDC (pin 6) and GND (pin 5).

2.7 Dimensions: 88mmx33mmx17mm

2.8 Environment : -25° to +70° C,

5% to 95% relative humidity

3.0 Installation

3.1 RS-232 and RS-422 Interface

The RS-232 interface is a DB-9 female connector.

The four-wire lines between the interface converter and the RS-422 equipment must be two twisted pairs. The wire marked T+ signal will be connected with R+ of another RS-422 equipment. The wire marked T- signal will be connected with R- of another RS-422 equipment. The wire marked R+ signal will be connected with T+ of another RS-422 equipment. The wire marked R- signal will be connected with T- of another RS-422 equipment.

Connect GND to GND for long connections.

3.2 Connection Diagram

3.21 Model ATC-101 connecting ATC-101

Model ATC-101 Model ATC-101

T- ----------------------------R-

T+ ---------------------------R+

R+ ---------------------------T+

R- ----------------------------T-

3.22 Model ATC-101 connecting other

RS-422 device

Model ATC-101 RS-422 Device

T- ----------------------------R-

T+ ---------------------------R+

R+ ---------------------------T+

R- ----------------------------T-

6-Pin Terminal Adapter