Moxa Technologies Transio A52, Transio A53 Quick Installation Manual

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P/N: 1802000520517

Transio A52/A53

Quick Installation Guide

Eighth Edition, June 2011

Overview

The Transio A52/A53 are smar t RS-232 to RS-422/485
bi-directional converters that allow one RS-232 port to be
converted into an RS-422 or RS-485 port. With the A52/A53 you
can control up to 32 devices within 1.2 km in a multidrop
environment.

To ease 2-wire RS-485 half-duplex control, Automatic Data
Direction Contr ol (ADDC) intell igence, which d oes not require s a
baudrate switch setting, is designed into each A52/A53 to simplify
your RS-485 software programming. Your applications can easily
manage data transmitting and receiving via the half-duplex
RS-485 port without using additional code. Compared to other
products that require using switches to set the clock speed
manually, the A52/A53 let you avoid many deve lopment and
maintenance hassles.

To meet the high reliability required by harsh industrial
environments, all RS-422/485 signa ls provide TVS p rotection. In
addition, the A53 provides 2 KV of optical isolation protection for
all signals at the RS-422/485 end.

Features and Specifications

• Serial interfa ce: RS-232, RS-422/485

• Port types: RS-232: RJ45;

RS-422/485: RJ45 or Terminal Block

• High speed, baudrate up to 921.6 Kbps; no switch setting
needed

• Signals:
RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND;
RS-422: TxD+(B)/-(A), RxD+(B)/-(A), RTS+(B)/-(A),
CTS+(B)/-(A), GND;
RS-485-Data+(B)/-(A), GND

• Supports Automatic Data Direction Control (ADDC) with no
baudrate switch settings for RS-485

• RS-485 data control modes: auto (ADDC) or by RTS

• RS-422 supports CTS, RTS signals for hardware flow control

• LED indicators for power and 4 signal states (TxD, RxD, RTS,

CTS)

• All RS-422/485 signals provide TVS protection .

• All RS-422/485 signals support up to 2 KV (DC) of optical

isolation protection (A53 only)

• Provides overloading protection when there are 2 signals
shorted together at the RS-422/485 end

• Built-in 120 ohm termination resistors for RS-422/RS-485
(selectable by jumper in RS-485 mode)

• Supports up to 32 units connected in an RS-485 multidrop
network

• CE/FCC approval

• 9 V 1.5 A UL 110/230 V power adaptor can support up to 4

converters

• An external power adaptor is required, with input voltage for
the converter ranging from DC +9V to +30V.

• Operating temper ature: 0 to 55°C

• Dimensions: 90 x 60 x 21 mm

• Mounting Kit: Plastic Plates and screws for mounting the

A52/A53 on a wall or sur face.

• Power consumption: A52: 157 mA max. (+9V); A53: 285 mA
max. (+9V)

Applications

• Multipoint data acquisition

• Factory automation

• Remote serial device control

• Building secur ity automation

• Critical indust rial control

Installation

Switch and jumper settings

To change the operation mode, remove the two screws on the top
of the converter, open the cover, and then use the array of sliding
switches to set the desired mode.

DIP switches are used to select the operation mode (RS-422 or
RS-485). For RS-485 mode, the control mode (By RTS or ADDC) is
also set by DIP switch.

Internal view of A52/A53 (*default settings)

SW1 SW2
RS-422 mode Off By RTS Off
RS-485 mode On* Auto Data Direction

Control (ADDC)

On*

In RS-422 mo de, RxD is autom atically set with a 120 ohm
terminating resistor.

In RS-485 mode, the 120 ohm terminating resistor is set by one
jumper.

When shorted, the resistor is enabled.

Basic Communication Wiring

Before placing a converter in an existing network, the converter
should be properly configured. The following diagrams show
typical layouts for both converters.

LED Indicators

LED indicators for TxD, RxD, RTS, CTS signals and PWR are located
on the top of the A52/A53. The indic ator light is NOT lit when there
is no signal, or the power is off.

TxD: Shows green when connected and transmitting data from
RS-232 to RS-422/485.

RxD: Shows green when connected and receiving data from
RS-232 to RS-422/485.

RTS: Shows green when connected and RS-232 RTS Signal is ON.

CTS: Shows green when connected and RS-232 CTS Signal is ON.

PWR: Shows green when the power is ON.

AUTO

485

RTS

422

JP

TxD ( 2 )
RxD (3 )
RTS( 4 )
C TS( 5 )
DSR( 6 )
GND(7)
DCD(8)
DTR(20)

RxD(2) TxD+ (B))
TxD(3) TxD-(A)
C TS( 4 ) Rx D + ( B)
RTS(5) RxD-(A)
DTR(6) GND
GND(7)
DCD(8)
DSR(20)

RxD + (B)

TxD + (B )
TxD - ( A)
GND

RxD -( A)

RS-2 3 2

Host

D 25 Female
Connector

B

A52/53 Converter

RS-422 Devices

T
X
D

R
X
D

R
T
S

C
T
S

P
W
R

Power

Power GND

RS-422/485

RS-422/485

RS-232

PC

Power

TxD ( 2 )
RxD (3 )
RTS( 4 )
C TS( 5 )
DSR( 6 )
GND(7)
DCD(8)
DTR(20)

RxD(2) Data + (B))
TxD(3) Da ta- (A)
C TS( 4 ) G N D
RTS( 5 )
DTR (6 )
GND(7)
DCD(8)
DSR(20)

Data+(B)
Dat a
GND

-(A)

RS-232

RS-485

Host

D 25 Female
Connector

B

A52/53 Converter

RS-485 Devices

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Europe: [phone]

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 2011 Moxa Inc. All r ights reserved.

Power Supply

The A52/A53 converters are designed for standard +24 VDC
unregulated power for use in industrial environments. Operation is
guaranteed when using any power supply between +9 and +30
VDC at 350 mA. An optional power adaptor (9 V 1.5 A UL 110/230
V) can support up to 4 converters (see the follow ing diagram).

A52/A53 Converter Connection Diagram

RS-232 Pinouts

10-pin RJ45 Jack

The RJ45 port for the RS-232 signal is
shown in the following figure.

A52/A53 RJ45 Connector Pinouts

Pin RS-232 Pin RS-232

1 DCD (Always On) 6 RxD
2 DSR 7 GND
3 RTS 8 CTS
4 GND 9 DTR
5 TxD 10 ---

NOTE

Each group of (DTR, DSR) pins are shorted, freeing users

from the hardware flow control cable wiring problem. For
this reason, we list two types of RS-232 cable wiring below.

Type 1: To connect the RS-232 side of A52/A53 to a DTE (e.g., PC

COM1/2) or DCE. (Be sure to check the precise DTE/DCE
pinouts. The following DTE/D CE pinouts are just an
example.)

A52/A53

RJ45

DTE Device
DB25 Male

DTE
Device
DB9 Male

DCE Device
DB25 Fem ale

DCD 8 1 8 DCD
DSR 2 20 4 6 DT R
RTS 3 5 8 4 CTS
GND 4 7 5 7 GND
TxD 5 3 2 2 RxD
RxD 6 2 3 3 T xD
GND 7 7 5 7 GND
CTS 8 4 7 5 RTS
DTR 9 6 6 20 DSR

Type 2: You can connect the RS-232 side of the A52/A53 to a DTE,

such as a terminal or PC COM1/2, with 3-pin wiring if you
don’t need h ardware flow control.

A52/A53

RJ45

DTE Device
DB25 Male

DTE Device
DB9 Male

DCE Device
DB25 F emale

TxD 5 3 2 2 RxD
RxD 6 2 3 3 TxD
GND 7 7 5 7 G ND

RS-422/RS-485 Pinouts

The RS-422/RS-485 port with RJ45 connector or Terminal Block
Connector is depicted as follows.

RS-422

Pin RS-422 with RJ45 Pin RS-422 with

Terminal Block

1 TxD – (A) 1 TxD + (B )
2 RTS – (A) 2 T xD – (A)
3 RTS + (B) 3 RxD + (B)
4/7 SG 4 RxD – (A)
5 TxD + (B) 5 SG
6 RxD + (B) 6 Power GND
8 CTS + (B) 7 VCCA (9V )
9 CTS – (A) --- --­10 RxD – (A) --- ---

NOTE

Pins 6 and 7 of the Terminal Block are for Power GND and
Power Input, which can be used instead of a power adaptor.

Be careful NOT TO confuse RS-422/RS-485 GND with
Power GND.
SG: Signal Grou nd

RS-485

Pin RS-485 with RJ45 Pin RS-

485 with Terminal Block

1 Data – (A) 1 Data + (B)
4 SG 2 Data – (A)
5 Data + (B) 5 SG
7 SG 6 Power GND

--- --- 7 VCCA 9 V

--- --- 8 ---

NOTE

Pins 6 and 7 of the Terminal Block are for Power GND and
Power Input, which can be used instead of a power adaptor.

Be careful NOT TO confuse RS-422/RS-485 GND with
Power GND. SG: Signal Ground

CE WARNING

This is a

Class A product. In a domestic environment, this

product may cause radio interference in which case
the user may be required to take appropriate measures.

Federal Communications Commission Statement

FCC - This device comp lies with part 15 of the FCC Rule s. Operation
is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation.

FCC WARNING

This equipment has been tested and found to comply with

the limits for a Class A digital device, pursuant to
part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful
interference when the equipment is operated in a

commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed

and used in accordance with the instruction
manual, may cause harmful interference to radio
communications. Operation of this equipment in a
residential are a is likely to cau se harmful inter ference in
which case the user will be required to correct the
interference at his own expense..

1 2 3 4 5 6 7

RJ45 Connector

Terminal Block Connector

1 2 3 4 5 6 7 8 9 10

1 10