HHC-N8I8OP

top view

front view

back view

bottom view

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

Amazon.com: Walfront 8 Channel Network Relay Module Remote Control Relay Device Ethernet to RS485, TCP Relay Module: Home & Kitchen

8 way network relay RS485 to Ethernet switch controller MODBUS TCP IP relay|Relays| - AliExpress

8I8O-road Modbus TCP relay switch_DANIU-IoT

Умный дом - Общая тема - 4PDA

Need help with Baidu Wangpan - Chinese Computing and Electronics - Chinese-forums.com

natm/iocontrollergw: I/O Controller Gateway

Sigmund Kreuzer / HHC-N-8I8O Relais board · GitLab