MOXA Transio A52 / A53

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MOXA Transio A52 / A53

Entry-Level RS-232 to RS-422/485 Converters



The Transio A52 and A53 are smart RS-232 to RS-422/485 bi-directional converters that come with all of the great technical specs that Moxa is known for. This includes data direction control built into the hardware for both the RS-422 and RS-485 interfaces, LED indicators for power and signal states, and surge protection and isolation protection. The last two features take care of some of the major problems faced by serial communication connections in industrial environments.

Serial Connection Problems in Industrial Environments

Serial communication and reliability can be adversely affected in a hazardous industrial environment. The wiring associated with serial communication devices could be surrounded by power lines, motors, or equipment that produces static electricity. If this is the case, the serial devices could be damaged by sudden surge waves produced by this type of equipment. In this situation, surge protection that uses TVSS (Transient Voltage Surge Supression) is the solution.

When two serial devices are directly connected, but separated by a long distance, the unbalanced ground voltage could cause serious damage. Unbalanced ground voltage between two serial ports forms a "ground loop," introducing a large current between the two pieces of serial equipment. In fact, the current could be so lare as to damage the equipment beyond repair. In this situation, the solution is to use isolation protection to provide complete isolation for both communication ports.

What is Surge Protection?

Surges are high amplitude pulses that last only a few millionths of a second in duration. They can be caused by heavy-duty equipment, power lines, short circuits, or large motors. A surge suppressor has the ability to absorb the high energy instantly and effectively to prevent the connected devices from being damaged.

What is Isolation Protection?

Electrical isolation is achieved by using a photo coupler to transform an electric signal into light, and then retransform the light back into an electric signal on the other side of the isolator. In this way, the two electric circuits are completely isolated from each other.

Further Information

Serial Communication

RS-232 Signals

RS-422/485 Signals
Supports RS-422, 2-wire RS-485 (DIP switch selectable)
Supports 4-wire RS-422, up to 10 nodes, 1.2 km with RTS, CTS
Supports 2-wire RS-485, up to 32 nodes, 1.2 km

Optical Isolation Protection
2 KV (A53), power/signal

Power EFT/Surge Protecction
25 KV ESD surge protection

RS-422/485 Side

RS-485 Data Direction Control

Serial Transmission

50 bps to 230.4 Kbps

Physical Characteristics


85 ¡¾ 5 g

90 x 60 x 21 mm

Environmental Limits

Operating Temperature
0 to 55¡ÆC (32 to 131¡ÆF)

Operating Humidity
5 to 95% RH

Storage Temperature
-20 to 75¡ÆC (-4 to 167¡ÆF)

Power Requirements

Input Voltage
9 to 30 VDC, 350 mA

Power Consumption
A52: 170 mA @ 9 V
A53: 285 mA @ 9 V

Over Current Protection
Protection against 2 signals shorted together

Regulatory Approvals

Class A

Class A

Ordering Information
Available Models
A52 RS-232 to RS-485 converter with 25 KV ESD surge protection
A52/110V or A52/230V A52 with 110V or 230V power adaptor
A53 RS-232 to RS-485 converter with 25 KV ESD surge protection and 2 KV isolation
A53/110V or A53/230V A53 with 110V or 230V power adaptor


PDF description Moxa Transio A52 / A53 Datasheet (229.3 kB)

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