Making/Projects/Serial Relay Controller
Jump to navigation
Jump to search
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