RS232 TO RS485 (B)

RS232 TO RS485 Metal case, wall mounted RS485, RS232

RS232 TO RS485 (B) V0 flame-retardant case, DIN rail type

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Onboard Interfaces

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Overview

RS232 TO RS485 (B) is an active electromagnetic isolated RS232 TO RS485 asynchronous bi-directional converter.

Feature

• Compatible with RS232/RS485 standard, converting the RS232 signal into balanced differential RS485 signal.
• Stable transmission at the rate of 300~115200bps.
• Onboard unibody power supply isolation, provides stable isolated voltage and needs no extra power supply for the isolated terminal.
• Onboard unibody digital isolation, allows signal isolation, high reliability, strong anti-interference, and low power consumption.
• Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic.
• Onboard resettable fuse and protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage protection, and improve shock resistance.
• Integrates optional RS485 output terminal 120R resistor, enabled/disabled via a switch.
• The onboard screw terminal, allows 6V~36V DC wide-range input.
• Industrial rail-mount ABS case design, small in size, easy to install, and cost-effective.

Parameters

Product Type	Active optoisolated RS232 to RS485 serial converter
Power Supply Interface	Power Supply	6~36V DC
	Interface Protection	Anti-reverse
Reliable Communication Rate	300~115200bps
Device Interface	RS232/RS485 standard complaint
RS232 Interface	Interface Form	Screw terminal
	Transmission Distance	About 15m
	Transfer Mode	Point to point
RS485 Interface	Interface Form	Screw terminal
	Direction Control	Hardware automatic control
	Interface Protection	Provides 600W lightning protection, surge protection and 15KV electrostatic protection
	Terminal Resistor	120R, can be enabled by switching
	Transmission Distance	About 1200m
	Transfer Mode	Point-to-multipoint (up to 32 nodes, repeaters are recommended for more than 16 nodes)
Product Appearance	Case	Rail-mount ABS case
	Dimensions	L × W × H: 91.6 × 23.3 × 58.7 mm
Operating Environment	Temperature Range	-15℃~70℃

Application Diagram

Application Distance

• Connect to the host/PLC/other devices or hosts with RS232, and can expand external RS485 devices for point-to-point half-duplex communication.

• Connect to the host/PLC/other devices or hosts with RS232, and can expand and cascade multiple RS485 devices for point-to-point half-duplex communication.

Interface Introduction

Note: Generally, RS485 interface only can be connected to A+ and B- . If you want to isolate the signal from the ground, you can connect it to the ground icon.

Dimensions

Hardware Test

Test Description

• Testing environment: PC (windows)
• Testing hardware:
  • RS232 TO RS485
  • USB TO RS485
  • PC (If there is no RS232 interface, you can choose USB TO RS232 (female socket) for adapting test.)

Hardware Connection Testing

The RS232 interface of RS232 TO RS485 (B) connects to the PC with a serial extension cable or USB TO RS232 cable. The RS485 interface is connected to RS232 TO RS485 (B). The USB interface of USB TO RS485 connects to the same PC and automatically tests.

Description: RS485 interface, generally can only connect A+ and B- , if you want the signals to isolate the ground, you should connect to the ground icon.

On the PC, open two SSCOMs, open the corresponding port number, set the same baud rate, and click on the timing send, you can send and receive normally, the software test screenshot is as follows:

Note: RS485 is a half-duplex communication, which cannot be used for sending and receiving tests at the same time. You can test the receiving after sending.

Resource

Software

• Sscom

FAQ

Question:Can RS485 be used without connecting to GNS?

 Answer:

• In some simple application scenarios, GND can be unconnected if there is no need for shared signals or a common reference ground between devices and there are no interference or safety issues with the circuit.
• However, for complex communication systems and applications with high signal integrity requirements, it is recommended that GND be connected according to the specification.

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Question:Why the communication is abnormal?

 Answer:

• RS232 connect to the correct power supply, to avoid reverse connection, please use a multimeter to confirm the voltage in the range of 6-36V;
• RS232 must be connected to GND, signal GND, and power GND to the same interface, TXD-RXD; RXD-TXD, if not on the exchange of TXD and RXD comparison test!

• RS485 must be connected like A-A B-B, the 120ohm resistor is not connected by default.

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Question:Supports reading and writing via Modbus RTU, and converts no-protocol RS232 to Modbus RTU?

 Answer:

• Does not support directly.
• The module itself does not directly support Modbus (reading and writing) and Modbus conversion functionality. It does not have an ID address but supports bridging Modbus devices for transparent data transmission.
• The module is a purely hardware-based RS485 to RS232 level conversion module. It does not support Modbus itself; it primarily handles the physical layer conversion of signals from RS232 format to RS485 format, or vice versa. It simply forwards the data without making any modifications to its content, allowing transparent transmission of various protocol data, including Modbus.
• Modbus reading, writing, and parameter configuration are performed on the upper computer (such as a PC) and the lower computer (such as RS485 sensors). The module is only responsible for data transmission, bridging the devices on both ends.

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Question:Does it support bidirectional communication?

 Answer:

Yes, it supports.

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