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Description
Overview:
- Elsay four-way Modbus relay module is equipped with mature and stable 8-bit MCU and RS485 level communication chip. Using standard MODBUS RTU format RS485 communication protocol, it can realize 4 input signal detection and 4 relay output, which can be used for digital detection or power control occasions.
- 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, the default is 9600bps, and it supports 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 off delay base is 0.1S, the maximum flash off/flash off time can be set to 0xFFFF*0.1S=6553.5S;
- Device address: range 1-255, default 255, support power-off save;
- The baud rate, input signal, relay status, and device address can be read using software/commands;
- There are 4 5V, 10A/250V AC 10A/30V DC relays on board, which can be activated continuously for 100,000 times, with diode effusion protection, and short response time;
- On-board relay switch indicator;
- Power supply voltage: DC7-24V, support DC socket/5.08mm terminal power supply, with input anti-reverse protection;
Hardware introduction and description
Board size
Interface introduction
- DC-005 socket: DC7-24V power input socket;
- VCC, GND: DC7-24V 5.08mm power input terminal;
- DC3.3-30V optocoupler signal input:
- IN1: Channel 1 positive
- IN2: Channel 2 positive
- IN3: Channel 3 positive
- IN4: Channel 4 positive
- GND_IN: Common terminal negative
- A+, B-: RS485 communication interface, A+, B- are respectively connected to A+, B- of the external control terminal;
- NC: Normally closed terminal, 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 closing, and shorted to COM after closing.
- 6, GND, RXD, TXD: TTL level UART communication interface, GND, RXD, TXD are respectively connected to GND, TXD, RXD of the external control terminal;
Product Parameters:
Modbus RTU Command:
Package Include:
- Item name: 4CH Modbus Relay Module
- Work voltage:DC 7V~24V
- Baud rate:4800/9600/19600bps(default 9600bps)
- Optocoupler input signal:DC 3.3V~30V
- Set address:1~255
- Relay contorl mode: ON/OFF,Delay_ON,Delay_OFF mode
- Delay time: 0~6553.5s
- Load: AC 250V 10A or DC 28V 10A
- Protocol:Modbus RTU
- Interface:RS485/TTL UART
- Control channel: 4channel
- Operating Temperature:-20℃~85℃
- Operating Humidity:5%~95%RH
- Module Size:93*90*20mm
Modbus RTU Command:
- Suppose the device address is 0xFF so return 00 10 00 00 00 01 02 00 FF EB 80 and the 9th btye is device address.
- Turn ON CH_1 Relay(Normal Mode):
- Send: FF 05 00 00 FF 00 99 E4
- Return: FF 05 00 00 FF 00 99 E4
- Note_1:The 3rd and 4th byte are relay addresses.So it can be 0x0000,0x0001,0x0002,0x0003.
- Note_2:The 5th and 6th byte are relay data.0xFF00 means turn ON relay and 0x0000 means turn OFF relay.
- Turn OFF CH_1 Relay(Normal Mode):
- Send: FF 05 00 00 00 00 D8 14
- Return: FF 05 00 00 00 00 D8 14
- Turn ON CH_2 Relay(Normal Mode):
- Send: FF 05 00 01 FF 00 C8 24
- Return: FF 05 00 01 FF 00 C8 24
- Turn OFF CH_2 Relay(Normal Mode):
- Send: FF 05 00 01 00 00 89 D4
- Return: FF 05 00 01 00 00 89 D4
- Turn ON All relays:
- Send: FF 0F 00 00 00 08 01 FF 30 1D
- Return: FF 0F 00 00 00 08 41 D3
- Turn OFF All relays:
- Send: FF 0F 00 00 00 08 01 00 70 5D
- Return: FF 0F 00 00 00 08 41 D3
- Set device address to 0x01:
- Send: 00 10 00 00 00 01 02 00 01 6A 00
- Return: 00 10 00 00 00 01 02 00 01 6A 00
- Note: The 9th btye is device address.
- Set device address to 0xFF:
- Send: 00 10 00 00 00 01 02 00 FF EB 80
- Return: 00 10 00 00 00 01 02 00 FF EB 80
- Read device address:
- Send: 00 03 00 00 00 01 85 DB
- Return: 00 03 02 00 FF C5 C4
- Note: The 5th btye is device address.
- Read relay status:
- Send: FF 01 00 00 00 08 28 12
- Return: FF 01 01 01 A1 A0
- Note:The 4th means which one relay.0 means OFF and 1 means ON.
- Read optocoupler input staturs:
- Send: FF 02 00 00 00 08 6C 12
- Return: FF 02 01 01 51 A0
- Note:The 4th means which one input.0 means low level signal input and 1 means high level signal input.
- Set baud rate 4800bps:
- Send: FF 10 03 E9 00 01 02 00 02 4A 0C
- Return: FF 10 03 E9 00 01 C5 A7
- Note:The 9th btye is baud rate value.0x02 is 4800bps.0x03 is 9600bps.0x04 is 19200bps.
- Set baud rate 9600bps:
- Send: FF 10 03 E9 00 01 02 00 03 8B CC
- Return: FF 10 03 E9 00 01 C5 A7
- Set baud rate 19200bps:
- Send: FF 10 03 E9 00 01 02 00 04 CA 0E
- Return: FF 10 03 E9 00 01 C5 A7
- Turn ON CH_1 Relay(2S Flashing Mode):
- Send: FF 10 00 03 00 02 04 00 04 00 14 C5 9F
- Return: FF 10 00 03 00 02 A4 16
- Note_1:The 3rd and 4th byte are relay addresses.So CH1~CH4 can be 0x0003,0x0008,0x000D,0x0012.
- Note_2:The 10th and 11th byte are delay time in second.The minimum delay time is 0.1s.Relay will OFF after delay time.So the delay time in this command is : 0x0014*0.1=2S.
- Turn OFF CH_1 Relay(3S Flashing Mode):
- Send: FF 10 00 03 00 02 04 00 02 00 1E A5 99
- Return: FF 10 00 03 00 02 A4 16
- Note:Relay will ON after delay time.So the delay time in this command is : 0x001E*0.1=3S.
Package Include:
- 1PC 4CH Modbus Relay Module
