Baud rate converter RS232485 to RS485422 photoelectric isolation signal amplifier repeaters

The baud rate of the two ends of the device can be set, and the relay amplifying function and the baud rate conversion between the following communication modes can be realized respectively:

(1) RS232 and RS485

(2) RS485 and RS485

(3) RS232 and RS422

(4) RS485 and RS422

Factory direct selling, can open 17% VAT invoices;

Baud rate converter RS232/485 to RS485/422 photoelectric isolation signal amplifier with state indicator lamp, the baud rate at both ends can be set separately; RS232 and RS485/422 can be set for different baud rates to achieve baud rate matching at both ends; customizable protocol conversion; photoelectric isolation; automatic identification of RS485 or RS422 interfaces; guide rail installation.

First, product introduction

232/485CONVERTER is a bidirectional interface converter between RS232 and RS485. It is used between the main control unit, the main control unit and the MCU peripherals to form a point-to-point and point-to-multipoint remote multi-machine communication network. Response communication, widely used in industrial automation control systems, card, access control system, parking system, self-service banking system, bus toll system, canteen selling system, company employee attendance management system, highway toll station system and so on.
232/485CONVERTER can convert TXD and RXD signals of RS232 serial port into two-wire balanced half-duplex RS485 signal; DC12V-DC24V wide voltage external power supply, built-in isolated conversion power supply, so that RS232 end and RS485 meter can achieve complete electrical isolation The high degree of protection can effectively protect the field equipment from damage.

Second, the performance parameters

1. Serial port characteristics: The serial port is compatible with EIA/TIA RS232C and RS485 standards;
2, working voltage: DC12V_DC24V

3. Working mode: asynchronous half-duplex;

4. Transmission medium: ordinary line, twisted pair or shielded line;

5. Transmission rate: 300115200bps;

6, transmission distance: 5m

7, communication protocol: transparent; -1

8, working environment: -2CTC to 7CTC relative humidity of 5% to 95%;

9, signal: RS232--TXD, RXD, GND

RS485—Data+, Data-;

Third, Connection mode
1. The devices GND, RX, and TX are connected to the GND, TX, and RX of the RS232 terminal respectively, that is, the device GND is connected to the RS232 terminal GND, the device TX is connected to the RS232 terminal RX, and the device RX is connected to the RS232 terminal TX.
2. The devices D+ and D- are connected to the RS485 terminals A+ and B- respectively.

The connection diagram is as follows:

Fourth, failure analysis
1. Data communication is unsuccessful;
A. Check if the power supply is normal.
B. Check if the RS232 interface connection is correct;
C. Check if the RS485 interface is connected correctly.
2. Data is lost or garbled;
A. Detect whether the data rate and format of the two segments of the data communication device are consistent;
B, can add matching resistor 1/4W120Q.