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So I purchased this device from a company in china thinking, I'm savvy, I'll be able to figure it out.

http://www.ebay.com/itm/RS232-DC-12V-8Ch-Serial-control-computer-control-switch-Relay-Board-Module-/261695306230?hash=item3cee4179f6:g:UVwAAOSwWnFWBPYq

Well now that I have it, I can not figure out RS232 commands to issue and I can not find a manual anywhere. I've tried looking at similar devices and issuing commands like "FF 01 01" which equates to "addressofboard, relay, state" in other similar devices. Can anyone help me find a manual or has anyone ever used this thing?

copekyle
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  • The very short description for this board says that each data frame contains 8 bytes. Try to send something like 01 01 01 01 01 01 01 01 – Helen Downs Nov 10 '15 at 10:35

1 Answers1

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I finally got a reply from the manufacturer. It's so complicated that I would have never guess the correct order. Here are the commands:

Close 1 channel：56 01 13 00 00 01 01 6C Open 1 channel ：56 01 13 00 00 01 00 6B

Close 2 channel：56 01 13 00 00 02 02 6E Open 2 channel：56 01 13 00 00 02 00 6C

Close 3 channel：56 01 13 00 00 04 04 72 Open 3 channel：56 01 13 00 00 04 00 6E

Close 4 channel：56 01 13 00 00 08 08 7A Open 4 channel：56 01 13 00 00 08 00 72

Close 5 channel：56 01 13 00 00 10 10 8A Open 5 channel：56 01 13 00 00 10 00 7A

Close 6 channel：56 01 13 00 00 20 20 AA Open 6 channel：56 01 13 00 00 20 00 8A

Close 7 channel：56 01 13 00 00 40 40 EA Open 7 channel：56 01 13 00 00 40 00 AA

Close 7 channel：56 01 13 00 00 80 80 6A Open 7 channel：56 01 13 00 00 80 00 EA

The structure is weird to me but I'm sure it makes sense somewhere:

(data, device address, function, empty, empty, relay, state, checksum)

The checksum is an addition of all the values and taking the 8th value of that addition.

copekyle
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