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RS232-TO-RS485-422 Guide

Resource

Datasheet


Overview

RS232 TO RS485/422, an industrial grade RS232 to RS485/422 isolated converter, boasts industrial grade rail-mount case design and protection circuits such as the built-in power isolation, ADI magnetical isolation, and TVS diode. It is easy to operate RS232 TO RS485/422 as it features zero-delay automatic transmission conversion, faster communication speed, stability, reliability, and safety, which is applicable for scenarios with high communication requirements.

Features

  • Onboard SP3232EEN and SP485EEN chips. Fast communication, stable and reliable, better compatibility.
  • Stable transmission at the rate of 300~921600bps.
  • 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 self-recovery fuse and protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage proof, and improve shockproof performance.
  • Onboard 15KV ESD isolation protection and 600W lightning proof & anti-surge protection.
  • Onboard 120R terminal resistor on the RS485/RS422 interface, disabled by default, configurable by jumper.
  • Onboard power supply screw terminal, allows 5V~36V DC wide-range input.
  • 3 LEDs for indicating the power and transceiver status.
  • Industrial rail-mount ABS case design, small in size, easy to install, and cost-effective.

Version Selection


Parameters

PRODUCT TYPEActive digital isolated RS232 to RS485/422 serial converter
BAUD RATE300bps ~ 921600bps
HOST PORTRS232
DEVICE PORTRS485/422
RS232 PortConnectorDB9 male/female
RS485/422ConnectorScrew terminal
RS485A+, B-, GND
RS422TA, TB, RA, RB, GND
Direction controlHardware automatic control
Protection600W lightningproof and surge-suppress, 15KV ESD protection (Onboard 120ohm balancing resistor)
Transmission distanceAbout 1200m (in low-speed scenario)
Transmission ModePoint-to-multipoints (up to 32 nodes, it is recommended to use repeaters for 16 nodes or more)
IndicatorPWRRed power indicator, lights up when the voltage is detected
TXDGreen TX indicator, lights up when the RS232 port sends data
RXDBlue RX indicator, lights up when the device ports send data back to RS232
ENVIRONMENT REQUIREMENTSTemperature Range-40℃ ~85℃
AppearanceCaseRail-mount ABS case, suitable for 35mm DIN rail
Dimensions81.9 × 54.0 × 32.0mm

Onboard Interface


Dimensions


Function Test

Here we take USB TO 4CH Serial Converter as the example:

RS232 TO RS485 Test

Hardware Connection

RS232 TO RS485/422USB TO 4CH Serial Converter
RS485 - A+Port C - TA
RS485 - B-Port C - TB
RS485 - GNDPort C - GND
RS232 - RXDPort D - TXD
RS232 - TXDPort D - RXD
RS232 - GNDPort D - GND

Software Operation

  • Enable two SSCOM.


  • Select the COM port corresponding to Port C and Port D of the USB TO 4CH Serial Converter respectively.


  • Input the characters to be sent, select "Show Time and Packet" to view it more intuitively, and then click on "Open COM".


  • Both select the 100ms of the SSCOM, and you can see the effect.


RS232 TO RS422 Test

Hardware Connection

RS232 TO RS485/422USB TO 4CH Serial Converter
RS422 - TAPort C - RA
RS422 - TBPort C - RB
RS422 - RAPort C - TA
RS422 - RBPort C - TB
RS422 - GNDPort C - GND
RS232 - RXDPort D - TXD
RS232 - TXDPort D - RXD
RS232 - GNDPort D - GND

Software Operation

  • Enable two SSCOM.


  • Select the COM port corresponding to Port C and Port D of the USB TO 4CH Serial Converter respectively.


  • Input the characters to be sent, select "Show Time and Packet" to view it more intuitively, and then click on "Open COM".


  • Both select the 100ms of the SSCOM, and you can see the effect.


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