Moxa Technologies Transio A52 Quick Installation Manual

Transio A52/A53
Quick Installation Guide
Eighth Edition, June 2011
Overview
The Transio A52/A53 are smart 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 Control (ADDC) intelligence, which does not requires 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 development and
maintenance hassles.
To meet the high reliability required by harsh industrial
environments, all RS-422/485 signals provide TVS protection. In
addition, the A53 provides 2 KV of optical isolation protection for
all signals at the RS-422/485 end.

Features and Specifications

• Serial interface: 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
P/N: 1802000520517
– 1 –
• 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 temperature: 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 surface.
• Power consumption: A52: 157 mA max. (+9V); A53: 285 mA
max. (+9V)
Applications
• Multipoint data acquisition • Building security automation
• Factory automation • Critical industrial control
• Remote serial device 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.
JP
AUTO RTS
485
422
– 2 –
Internal view of A52/A53 (*default settings)
SW1 SW2
RS-422 mode Off By RTS
RS-485 mode On* Auto Data Direction
Control (ADDC)
In RS-422 mode, RxD is automatically 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.
Po we r
RS-422/485 Po we r
RS-422/485
PC
RS-232
Po we r G ND
T xD(2)
RS-232 RxD(2) T xD+ (B)) RxD+ (B)
RxD(3)
T xD(3) TxD-(A) RxD-(A)
RTS(4) CT S(4) RxD+ (B) T xD+ (B)
CT S(5) RTS(5) RxD-(A) T xD-(A)
DSR(6) DTR(6) GND GND
GND(7)
GND(7)
RS-422 De vic e s
DCD(8) DCD(8)
DTR(20) DSR(20)
D 25 Fe m a le B
Ho st A52/53 Converter
Co nne c to r
RS-485
T xD(2) RS-232 RxD(2) Da ta + (B)) Da ta + (B)
RxD(3)
T xD(3) Da ta -(A) Da ta -(A)
RT S(4)
CT S(4) GND GND
CT S(5) RT S(5)
DSR(6) DT R(6)
GND(7) GND(7)
RS-485 De vic e s
DCD(8)
DCD(8)
DT R(20)
DSR(20)
D 25 Fe m a le B
Ho st A52/53 Converter
Co nne c to r

LED Indicators

LED indicators for TxD, RxD, RTS, CTS signals and PWR are located
on the top of the A52/A53. The indicator light is NOT lit when there
is no signal, or the power is off.
T R R C P
X X T T W
D D S S R
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.
– 3 –
Off
On*