Moxa A53, A52 User Manual
AUTO
485
RTS
422
JP
Tx D( 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 ) R xD + ( B)
RTS(5) RxD-(A)
DTR(6) GND
GND(7 )
DCD(8 )
DSR(20)
RxD + ( B)
Tx D+ ( B)
Tx D- ( A)
GND
RxD -( A)
RS-2 3 2
Host
D 25 Female
Connec tor
B
A52/53 Converter
RS-422 Devices
Power
Power GND
RS-422/485
RS-422/485
RS-232
PC
Power
Tx D( 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 )
D TR(6 )
GND(7 )
DCD(8 )
DSR(20)
Data+ (B)
Dat a
GND
-(A)
RS-232
RS-485
Host
D 25 Female
Connec tor
B
A52/53 Converter
RS-485 Devices
Internal view of A52/A53 (*default settings)
SW1 SW2
RS-422 mode Off By RTS Off
RS-485 mode On* Auto Data Direction
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.
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.
• 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.
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.
• 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
• Factory automation
• Remote serial device control
• Building security automation
• Critical industrial control
Installation
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
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
– 1 – – 2 – – 3 –
P/N: 1802000520517
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.
is no signal, or the power is off.
T
R
R
X
X
T
D
D
S
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.
Control (ADDC)
C
P
T
W
S
R
On*
The Americas:
+1-714-528-6777 (toll-free: 1-888-669-2872)
Each group of (DTR, DSR) pins are shorted, freeing users
Terminal Block
Pins 6 and 7 of the Terminal Block are for Power GND and
Power Input, which can be used instead of a power adaptor.
485 with Terminal Block
Pins 6 and 7 of the Terminal Block are for Power GND and
Power Input, which can be used instead of a power adaptor.
Class A product. In a domestic environment, this
This equipment has been tested and found to comply with
commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed
1 2 3 4 5 6 7
RJ45 Connector
Terminal Block Connector
1 2 3 4 5 6 7 8 9 10
1 10
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 following diagram).
A52/A53 Converter Connection Diagram
RS-232 Pinouts
The RJ45 port for the RS-232 signal is
shown in the following figure.
10-pin RJ45 Jack
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 hardware flow control.
A52/A53
RJ45
TxD 5 3 2 2 RxD
RxD 6 2 3 3 TxD
GND 7 7 5 7 GND
DTE Device
DB25 Male
DTE Device
DB9 Male
DCE Device
DB25 Female
RS-422/RS-485 Pinouts
The RS-422/RS-485 port with RJ45 connector or Terminal Block
Connector is depicted as follows.
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
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/DCE pinouts are just an
example.)
A52/A53
RJ45
DCD 8 1 8 DCD
DSR 2 20 4 6 DTR
RTS 3 5 8 4 CTS
GND 4 7 5 7 GND
TxD 5 3 2 2 RxD
RxD 6 2 3 3 TxD
GND 7 7 5 7 GND
CTS 8 4 7 5 RTS
DTR 9 6 6 20 DSR
– 4 – – 5 – – 6 –
DTE Device
DB25 Male
DTE
Device
DB9 Male
DCE Device
DB25 Female
RS-422
Pin RS-422 with RJ45 Pin RS-422 with
1 TxD – (A ) 1 TxD + (B)
2 RTS – (A) 2 TxD – (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
Be careful NOT TO confuse RS-422/RS-485 GND with
Power GND.
SG: Signal Ground
RS-485
Pin RS-485 with RJ45 Pin RS-
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
Be careful NOT TO confuse RS-422/RS-485 GND with
Power GND. SG: Signal Ground
CE WARNING
This is a
product may cause radio interference in which case
the user may be required to take appropriate measures.
Federal Communications Commission Statement
FCC - This device complies with part 15 of the FCC Rules. 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
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
and used in accordance with the instruction
manual, may cause harmful interference to radio
communications. Operation of this equipment in a
residential area is likely to cause harmful interference in
which case the user will be required to correct the
interference at his own expense..
Europe: +49-89-3 70 03 99-0
Asia-Pacific: +886-2-8919-1230
China: +86-21-5258-9955 (toll-free: 800-820-5036)
2011 Moxa Inc. All rights reserved.
www.moxa.com/support
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