Modbus-RTU relay outputs TTL/ RS485 interface

Reference description

• The single Modbus relay module is equipped with a mature and stable 8-bit MCU and
• RS485 level communication chip. RS485 communication using standard MODBUS RTU format
• Communication protocol, which can realize 1 optical coupler input signal detection and 1 relay output, which can be used for digital

Product parameter

• Onboard mature and stable 8bit MCU and MAX485 level conversion chip
• Communication protocol: support standard Modbus RTU protocol
• Communication interface: support RS485/TTL UART interface
• Communication baud rate: 4800/9600/19200, default 9600bps, support power-off save
• Optocoupler input signal range: DC3.3-30V (this input cannot be used for relay control)
• Output signal: relay switch signal, support manual, flash off, flash off mode, flash off/flash
• The base number of the time delay is 0.1S, and the maximum flash-off/flash-off time can be set as
• Device address: range 1-255, default 255, support power-off save
• Onboard 1 way 5V, 10A/250V AC 10A/30V DC relay, can suck continuously
• 100,000 times, with diode effusion protection, short response time
• On-board relay switch indicator
• Supply voltage: DC7-24V, with input anti-reverse connection protection

1. VCC, GND: DC7-24V power input
2. IN, GND__IN: DC3.3-30V optocoupler signal input
3. A+, B-: RS485 communication interface, A+, B- are respectively connected to A+, B- of the external control terminal
4. Relay switch signal output NC: Normally closed, the relay is short-connected with COM before it is closed, and it is suspended after it is closed; COM: public end; NO: Normally open end, the relay is suspended before the pull-in, and short-circuited with COM after the pull-in.
5. Relay indicator light: lights up when the relay is closed
6. GND, RXD, TXD: TTL level UART communication interface, GND, RXD, TXD respectively. Connect to the GND, TXD, RXD of the external control terminal, support the connection of 3.3V/5V external TTL serial port
7. RS485 and TTL serial port selection. When using RS485 communication, DI connects to TXD and RO connects to RXD; when using TTL communication, both DI and RO connect to NC.
   -----------------