7-24V Modbus RTU 1, Channel Relay Module, RS485/TTL Anti-reverse, Connection


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SKU: 1121266
1. VCC, GND: DC7-24V power input
2. IN, GND: DC3.3-30V optocoupler signal input
3. A +, B-: RS485 communication interface, A +, B- are connected to A +, B-
4. Relay switch signal output
NC: normally closed end, the relay is short-circuited to COM before pull-in, and left floating after pull-in;
COM: public end;
NO: Normally open, the relay is suspended before the pull-in, and shorted to COM after the pull-in.
5. Relay indicator: lit when the relay is on
6. GND, RXD, TXD: TTL level UART communication interface, GND, RXD, TXD are respectively connected to GND, TXD, RXD of the external control terminal


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Brand: Generic
Category: Relay Modules
Tags: Modbus Relay modules

LC 1 channel Modbus relay module equipped with mature and stable 8-bit MCU and RS485 level communication chip,adopt standard MODBUS RTU format RS485 communication protocol, It can realize 1-way input signal detection and 1-way relay output, can be used for digital detection or power control occasions.


1. On-board mature and stable 8bit MCU and MAX485 level conversion chip
2. Communication protocol: support standard Modbus RTU protocol
3. Communication interface: Support RS485 / TTL UART interface
4. Communication baud rate: 4800/9600/19200, default 9600bps, support power saving
5. Photocoupler input signal range: DC3.3-30V (This input cannot be used for relay control)
6. Output signal: relay switch signal, support manual, flash-off, flash-off mode, the delay base of flash-off / flash-off is 0.1S, the maximum settable flash-off / flash-off time is 0xFFFF * 0.1S = 65535 * 0.1 S = 6553.5S
7. Device address: range 1-255, default 255, support power-down save
8. Onboard one 5V, 10A / 250V AC 10A / 30V DC relay, which can continuously attract 100,000 times, with diode leakage protection, short response time
9. Onboard relay switch indicator
10. Supply voltage: DC7-24V, with input anti-reverse protection

Package Includes:

1 x 7-24V Modbus RTU 1 Channel Relay Module RS485

SKU: 1121266 Category: Tag:
Relay indicator

lit when the relay is on

On-Board Chip

8bit MCU and MAX485

Communication Protocol

Modbus RTU protocol

Communication Interface

Support RS485 / TTL UART interface

Communication baud rate

4800/9600/19200, default 9600bps

Supply voltage(V)


Shipping Weight 0.026 kg
Shipping Dimensions 10 × 6 × 1 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects.  Reimbursement or replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China