RS232 TO RS485/422

RS232 TO RS485/422

RS232 TO RS485/422 (F) RS232, RS485, RS422

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Onboard Interfaces

Related Products

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 TYPE	Active digital isolated RS232 to RS485/422 serial converter
BAUD RATE	300bps ~ 921600bps
HOST PORT	RS232
DEVICE PORT	RS485/422
RS232	Connector	DB9 male/female
RS485/422	Connector	Screw terminal
	RS485	A+, B-, GND
	RS422	TA, TB, RA, RB, GND
	Direction control	Hardware automatic control
	Protection	600W lightningproof and surge-suppress, 15KV ESD protection (Onboard 120ohm balancing resistor)
	Transmission distance	About 1200m (in low-speed scenario)
	Transmission Mode	Point-to-multipoint (up to 32 nodes, it is recommended to use repeaters for 16 nodes or more)
Indicator	PWR	Red power indicator, lights up when the voltage is detected
	TXD	Green TX indicator, lights up when the RS232 port sends data
	RXD	Blue RX indicator, lights up when the device ports send data back to RS232
ENVIRONMENT REQUIREMENTS	Temperature Range	-40℃ ~85℃
Appearance	Case	Rail-mount ABS case, suitable for 35mm DIN rail
	Dimensions	81.9 × 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 RS485/422	USB TO 4CH Serial Converter
RS485 - A+	Port C - TA
RS485 - B-	Port C - TB
RS485 - GND	Port C - GND
RS232 - RXD	Port D - TXD
RS232 - TXD	Port D - RXD
RS232 - GND	Port D - GND

Software Operation

• Open two SSCOM interfaces.

• 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 RS485/422	USB TO 4CH Serial Converter
RS422 - TA	Port C - RA
RS422 - TB	Port C - RB
RS422 - RA	Port C - TA
RS422 - RB	Port C - TB
RS422 - GND	Port C - GND
RS232 - RXD	Port D - TXD
RS232 - TXD	Port D - RXD
RS232 - GND	Port D - GND

Software Operation

• Open two SSCOM interfaces.

• 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.

Resource

Datasheet

• SP3485E
• SP3232E

FAQ

Question:Is there a built-in 120-ohm termination resistor?

 Answer:

Yes, if the 120R matching resistor must be modified, move the jumper cap to the 120R position on the RS485/422 terminal.

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Question:What should be done in case of abnormal long-distance communication for RS485/422?

 Answer:

Move the jumper cap of RS485/422 to the 120 ohm position.

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Question:What should be done in case of abnormal short-distance communication for RS485/422, where the received data shows extra bits or garbled content?

 Answer:

Remove the two 120Ω termination matching resistors of RS485/422 and jump the jumper cap to NC.

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