Overview
Ethernet (TCP) and Modbus (RS-485) interfaced 8-channel relay output and 10 optocoupler input module.
Software
There is Chinese software to configure the MAC address, IP address, Modbus baud-rate, etc.
Factory Reset Button
The tactile button is hooked to pin 93 (PB7) of the microcontroller, it is used for factory reset.
Debug Interface
Header labeled "P2":
| Silkscreen | MCU Pin | Function |
|---|---|---|
| G | GND | |
| K | 76 | SWCLK/PA14 |
| S | 72 | SWDIO/PA13 |
| V | +3.3V |
Bill of Materials
HHC-N8I8OP-V1.2-2019/05/03
| Name | Markings |
|---|---|
| U5 | AMS1117-3.3 2011 |
| U6 | M2303ADN M4776028 MPSM23 |
| ?? | ST ULN2003 GO021010 |
| ?? | ATMLH021 02CM CN 2021E6H |
| ?? | GigaDevice GD32F107VCT6 CEEF481 AJ2038 |
| ?? | SP485EE 2027L H1PF54 |
| ?? | EL817 C038 |
| ?? | HanRun HR911105A 20/26 |
| ?? | HUI KE HK3FF-DC5V-SHG |
| ?? | KEFA KF2EDGV/R [2-pos] |
| ?? | KEFA KF2EDGV/R [3-pos] |
| ?? | KEFA KF2EDGV/R [12-pos] |
Online Resources
HHC-N8I8OP 8 Network TCP Relay Module Remote Control Relay Device DC7~24V | eBay (source for photos)
8 way network relay RS485 to Ethernet switch controller MODBUS TCP IP relay|Relays| - AliExpress
8I8O-road Modbus TCP relay switch_DANIU-IoT
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