Page 1
Serial Communication Interface Conversion Solution
A52/A53 DTE Device
RJ45 DB9 Male
RJ45 Plug Pin 1
TxD 5 2 RxD
RxD 6 3 TxD
GND 7 5 GND
A52/A53 DCE Device
RJ45 DB25 Female
RJ45 Plug Pin 1
TxD 5 2 RxD
RxD 6 3 TxD
GND 7 7 GND
RS-422/RS-485 Pinouts
The RS-422/RS-485 port with RJ45 connector
or Terminal Block Connector is depicted as
follows.
RJ45 Connector
1 2 3 4 5 6 7 8 9 10
Terminal Block Connector
1 2 3 4 5 6 7
7 SG
~RS-422
A52/A53
RJ45 Jack
Connector Pinouts Signals
1 TxD -(A)
2 RTS -(A)
3 RTS +(B)
4/7 SG
5 TxD +(B)
6 RxD +(B)
8 CTS +(B)
9 CTS -(A)
10 RxD -(A)
A52/A53
Terminal Block
Connector Pinouts Signals
1 TxD +(B)
2 TxD -(A)
3 RxD +(B)
4 RxD -(A)
5 SG
6 Power GND
7 VCCA (9V)
Note: Pins 6 and 7 of the Terminal Block are for
Power GND and Power Input, which is an
alternate option for power adapter. Be
careful TO NOT confuse RS-422/RS-485
GND with Power GND.
SG: Signal Ground
~RS-485
A52/A53
RJ45 Jack
Connector Pinouts Signals
1 Data-(A)
4 SG
5 Data+(B)
A52/A53
Terminal Block
Connector Pinouts Signals
1 Data+(B)
2 Data-(A)
5 SG
6 Power GND
7 VCCA 9V
Note : Pins 6 and 7 of the Terminal Block are for
Power GND and Power Input, which is an
alternate option for power adapter. Be
careful TO NOT confuse RS-422/RS-485
GND with Power GND.
SG: Signal Ground
Transio A52/53
Smart RS-232 to RS-422/485
Bi-directional Converter
Overview
Transio A52/53 is a smart RS-232 to RS-422/485
bi-directional converter, which allows one RS-232
port to be converted into an RS-422 or RS-485
port. With A52/53 you can control up to 32
devices, within 1.2 km, in a multidrop
environment.
To ease 2-wire RS-485 half-duplex control, fully
Automatic Data Direction Control (ADDC)
intelligence that requires no baud rate switch
settings is designed into each A52/53, simplifying
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 setting the clock speed manually with
switches, A52/53 lets you avoid many developing
and
maintenance hassles.
To meet the high reliability required by harsh
industrial environments, all RS-422/485 signals
provide TVS protection, and ESD up to 25 KV. In
addition, A53 provides 2 KV of optical isolation
protection for all signals at the RS-422/485 end.
RS-422/485
R45 ConnectorJ
RS-422/485
Terminal Block
Features and Specifications
• Serial interface: RS-232, RS-422/485
• Port types: RS-232: RJ45;
RS-422/485: RJ45 or Terminal Block
• High speed, baud rate 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;
External Power Connection
RS-232
R45 ConnectorJ
Power Jack
RS-485-Data+(B)/-(A), GND
• Supports fully Automatic Data Direction
Control (ADDC) with no baud rate 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. (ESD 8 KV, EFT 2KV)
• 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 with jumper by
RS-485 mode)
• Supports up to 32 units connected in an
RS-485 multidrop network
• CE approval
• 9V 1.5A UL/ TÜV 110V/230V power
adapter can support up to 4 converters
• An external power adapter 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 A52/53 on the wall or any surface.
• Power consumption: A52: 157 mA max.
(+9V); A53: 270A max. (+9V)
Mounting
Screw
RS-422/485 RS-232
Fixing Screw
Applications
• Multipoint data acquisition
• Factory automation
• Remote serial device control
• Building security automation
• Critical industrial control
Transio A52/53 User’s Manual P/N: 18020005204 5th Edition.
www.moxa.com ©2004 Moxa Technologies.
Moxa Technologies Co., Ltd
All rights reserved.
Page 2
Installation
Switch and jumper settings
To change the operation mode, remove the two
screws on 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
Internal view of A52/53
SW1
RS-422 mode Off
RS-485 mode On*
SW2
By RTS Off
Auto Data Direction Control (ADDC) On*
(* Default settings)
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.
Power
RS-422/485
RS-422/485
Powe r
Powe r GND
RS-232
PC
RS-232
TxD(2)
RxD(3)
RTS(4)
CTS(5)
DSR(6)
GND(7)
DCD(8)
DTR(20)
Host
TxD(2)
RxD(3)
RTS(4)
CTS(5)
DSR(6)
GND(7)
DCD(8)
DTR(20)
Host
RxD (2) TxD+( B))
TxD (3) TxD- (A)
CTS (4) RxD+( B)
RTS (5) RxD- (A)
DTR (6) G ND
GND(7)
DCD(8)
DSR(20)
D25 Female
B
A52/53 Converter
Connector
RS-232
RxD (2) Data+ (B))
TxD (3) Data -(A)
CTS (4) GND
RTS (5)
DTR (6)
GND(7)
DCD(8)
DSR(20)
D25 Female
B
A52/53 Converter
Connector
RS-485
RxD+(B)
RxD-(A)
TxD+(B)
TxD-(A)
GND
RS-422 Devices
Data+(B)
Data
GND
RS-485 Devices
LED Indicators
LED indicators for TxD, RxD, RTS, CTS
signals and PWR are located on top of
A52/A53. The indicator light is NOT lit when
there is no signal, or the power is off.
T
X
D
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 power is ON.
Power supply
A52/53 converters are designed for standard
+24 VDC unregulated power for use in
industrial
guaranteed when using any power supply
between +9 and +30 VDC, 350 mA.
An optional power adapter (9V 1.5A UL/TUV
110V/230V) can support up to 4 converters
(see the following diagram).
environments. Operation is
A52/53 Converter Connection Diagram
R
R
C
X
D
P
T
T
W
S
S
R
-(A)
RS-232 Pinouts
The RJ45 port for the RS-232 signal is shown
in the following figure.
10-pin RJ45 Jack
110
A52/A53 RJ45
Connector Pinouts RS-232 Signals
1 DCD Always On
2 DSR
3 RTS
4 GND
5 TxD
6 RxD
7 GND
8 CTS
9 DTR
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.
Typ e 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 DTE Device
RJ45 DB25 Male
DCD 1 8 DCD
DSR 2 20 DTR
RTS 3 5 CTS
GND 4 7 GND
TxD 5 3 RxD
RxD 6 2 TxD
GND 7 7 GND
CTS 8 4 RTS
DTR 9 6 DSR
RJ45 Plug Pin 1
A52/A53 DTE Device
RJ45 DB9 Male
RJ45 Plug Pin 1
DCD 1 1 DCD
DSR 2 4 DTR
RTS 3 8 CTS
GND 4 5 GND
TxD 5 2 RxD
RxD 6 3 TxD
GND 7 5 GND
CTS 8 7 RTS
DTR 9 6 DSR
A52/A53 DCE Device
RJ45 DB25 Female
RJ45 Plug Pin 1
DCD 1 8 DCD
DSR 2 6 DTR
RTS 3 4 CTS
GND 4 7 GND
TxD 5 2 RxD
RxD 6 3 TxD
GND 7 7 GND
CTS 8 5 RTS
DTR 9 20 DSR
Type 2: You can connect the RS-232 side of
A52/A53 to a DTE, e.g., a terminal or PC
COM1/2, with 3-pin wiring if you don't
need hardware flow control.
A52/A53 DTE Device
RJ45 DB25 Male
RJ45 Plug Pin 1
TxD 5 3 RxD
RxD 6 2 TxD
GND 7 7 GND
Transio A52/53 User’s Manual Transio A52/53 User’s Manual
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