Making/Projects/Serial Relay Controller

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Serial Relay Controller

Introduction

Several makes of multi channel relay boards that are controlled over an RS232 serial port. I am testing with a model that uses a ULN2803A chip also noted as a `darlington array` and an RS232 level shifter chip that is hard to read the label on.

Other labels silkscreened on the board

`R221A08`
`8 Channel RS232 Relay`
`eletechsup`

Control Commands

0 - Read
1 - Open
2 - Close
3 - Toggle
4 - Momentary ~200ms
5 - Interlock

FAQs

Q How can I run this as a user?
A Add user to dialout group for access to ttyS or ttyUSB devices

Resources