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== 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":
{| class="wikitable"
! Silkscreen
! MCU Pin
! Function
|-
| G
| GND
|-
| K
| 76
| SWCLK/PA14
|-
| S
| 72
| SWDIO/PA13
|-
| V
| +3.3V
|}
== Bill of Materials ==
<pre>HHC-N8I8OP-V1.2-2019/05/03</pre>
{| class="wikitable"
! Name
! Markings
|-
| U5
| AMS1117-3.3<br/>2011
|-
| U6
| M2303ADN<br/>M4776028<br/>MPSM23
|-
| ??
| ST ULN2003<br/>GO021010
|-
| ??
| ATMLH021<br/>02CM CN<br/>2021E6H
|-
| ??
| GigaDevice GD32F107VCT6<br/>CEEF481<br/>AJ2038
|-
| ??
| SP485EE<br/>2027L<br/>H1PF54
|-
| ??
| EL817<br/>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 ==
[https://www.amazon.com/dp/B083KK3CZL Amazon.com: Walfront 8 Channel Network Relay Module Remote Control Relay Device Ethernet to RS485, TCP Relay Module: Home & Kitchen]
[https://www.aliexpress.com/i/4000127882795.html 8 way network relay RS485 to Ethernet switch controller MODBUS TCP IP relay|Relays| - AliExpress]
[http://www.daniu-iot.com/eacp_view.asp?id=268 8I8O-road Modbus TCP relay switch_DANIU-IoT]
[https://4pda.to/forum/index.php?showtopic=789600&st=2520#entry96494645 Умный дом - Общая тема - 4PDA]
[https://www.chinese-forums.com/forums/topic/58422-need-help-with-baidu-wangpan/ Need help with Baidu Wangpan - Chinese Computing and Electronics - Chinese-forums.com]
[https://github.com/natm/iocontrollergw natm/iocontrollergw: I/O Controller Gateway]
[https://gitlab.com/sigmundk/hhc-n-8i8o-relais-board Sigmund Kreuzer / HHC-N-8I8O Relais board · GitLab]
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":
{| class="wikitable"
! Silkscreen
! MCU Pin
! Function
|-
| G
| GND
|-
| K
| 76
| SWCLK/PA14
|-
| S
| 72
| SWDIO/PA13
|-
| V
| +3.3V
|}
== Bill of Materials ==
<pre>HHC-N8I8OP-V1.2-2019/05/03</pre>
{| class="wikitable"
! Name
! Markings
|-
| U5
| AMS1117-3.3<br/>2011
|-
| U6
| M2303ADN<br/>M4776028<br/>MPSM23
|-
| ??
| ST ULN2003<br/>GO021010
|-
| ??
| ATMLH021<br/>02CM CN<br/>2021E6H
|-
| ??
| GigaDevice GD32F107VCT6<br/>CEEF481<br/>AJ2038
|-
| ??
| SP485EE<br/>2027L<br/>H1PF54
|-
| ??
| EL817<br/>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 ==
[https://www.amazon.com/dp/B083KK3CZL Amazon.com: Walfront 8 Channel Network Relay Module Remote Control Relay Device Ethernet to RS485, TCP Relay Module: Home & Kitchen]
[https://www.aliexpress.com/i/4000127882795.html 8 way network relay RS485 to Ethernet switch controller MODBUS TCP IP relay|Relays| - AliExpress]
[http://www.daniu-iot.com/eacp_view.asp?id=268 8I8O-road Modbus TCP relay switch_DANIU-IoT]
[https://4pda.to/forum/index.php?showtopic=789600&st=2520#entry96494645 Умный дом - Общая тема - 4PDA]
[https://www.chinese-forums.com/forums/topic/58422-need-help-with-baidu-wangpan/ Need help with Baidu Wangpan - Chinese Computing and Electronics - Chinese-forums.com]
[https://github.com/natm/iocontrollergw natm/iocontrollergw: I/O Controller Gateway]
[https://gitlab.com/sigmundk/hhc-n-8i8o-relais-board Sigmund Kreuzer / HHC-N-8I8O Relais board · GitLab]