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Rs232 Hot Tub Automatic Control


jerdam
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Hello everyone,

I have a chinese hot tub which has an rs232 cable connection what is connected with control panel GD-3003 (http://www.mrtubby.co.uk/gd-3003-chinese-topside-hot-tub-control-panel-140-p.asp).

Is there a possibility to control a hot tub heater, temperature, pumps, etc. with rs232 cable connected to computer or some other brand of control panels which has more options?

any help suggestion is appreciated :)

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Doubtful- you'll need to connect it with something you know works- just because the plug uses the same type of interface doesn't mean it's compatible- many topsides of the same manufacturer use different communication protocol language. Don't buy unless you *know* it's compatible.

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If you have a multi-meter or even better an oscilloscope, put it on pin 2 and see if you are getting either ~12VDC RMS with the meter or you can see ~24Vp-p with the scope. If you can, then there is a good chance the signals are RS232 serial. At that point, connect a computer running a terminal program like HyperTerminal (built into Windows XP) and see if you can see any data. You'll have to play with the baud rates to see what it's set at, but it's probably 4800 or 9600 baud.

Of course, this is ALL pending on the chance that the controller is periodically spitting out serial data on this port. It might require seeing a command first, before talking. It's worth a shot though.

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If you have a multi-meter or even better an oscilloscope, put it on pin 2 and see if you are getting either ~12VDC RMS with the meter or you can see ~24Vp-p with the scope. If you can, then there is a good chance the signals are RS232 serial. At that point, connect a computer running a terminal program like HyperTerminal (built into Windows XP) and see if you can see any data. You'll have to play with the baud rates to see what it's set at, but it's probably 4800 or 9600 baud.

Of course, this is ALL pending on the chance that the controller is periodically spitting out serial data on this port. It might require seeing a command first, before talking. It's worth a shot though.

Ummmmmmmmmmmmmmm My head hurts.

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