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Connecting to it with a PC is a simple job of hooking up an RS485 to RS232/USB and using a terminal program* with settings 9600 8 N 1.
The RS485 is half-duplex and runs in master/slave mode. So first step is to document the RS485 protocol for the system generally and then keypad and Ethernet devices. Of course there could be other commands I haven’t seen but, we’ll never know unless they do crop up at some point. Interfacing directly with a keypad (without the alarm) allowed me to finish this by testing out extra options not seen on the real bus. Sniffing the RS485 bus allowed me to work out the basic protocol for the Keypad.
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Unfortunately he didn’t document the protocol and the code was not written in a way that looked as though it was intended to be read by anyone else. The most interesting thing I found was a project on GitHub called SolarSystem where the author had made his own control panel to talk to some galaxy peripherals such as the keypad and max4 rfid readers. Projects like openGalaxy talk over RS232 and just seem to process SIA messages. You’d think someone would have already documented this protocol, but it seems not. It has an RS485 bus that keypads and the Ethernet adapter (as well as other accessories: e.g. Although I could put my own adapter along side, in listen only mode, to capture the events and do something else with them too.įirst things first, how do you interface with the alarm? That much you can get from the manual. This project is just for fun, once I’ve finished playing with my backup alarm I’ll be sticking the LCE-01 on my real panel. Making your own device to save £1/month, by connecting to a less tried and tested platform of your own making, is a false economy. However that service costs just £1/month, including up to 20 SMS messages. The main reason to make your own would be flexibility, using it to connect to something other than their service. Of course you can’t really make them cheaper in any quantity, the biggest cost is the dev board and by the time you’ve bought that, the custom PCB, the other handful of parts and accounted for the time spent soldered them all together then they clearly aren’t making a big profit on them. They even say if you can make them much cheaper they’ll subcontract the manufacture to you. Very much the kind of thing you could make yourself – indeed the FAQ on the website says this and offers the firmware if you want to. The LCE-01 is a custom PCB which basically combines an off-the-shelf dev board (containing Ethernet/ microcontroller/ rs485 devices) with a buck dc-dc power supply and a few connectors. I contacted the maker to find out about updating the firmware on mine and he offered me a good deal on a part exchange so I went for it. I was already aware of the LCE-01 from SM Security Alarms as a cheaper alternative, with more functions like a Virtual Key Pad app, but £66 for a device I didn’t really have a use for was still a bit steep for someone who hates to part with money.
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Besides, if you’re at work, miles from home and in the middle of something, what what are you going to do if you get a notification that your house alarm has gone off?Įventually, by chance, I picked up a second hand official Ethernet adapter for the alarm at a car boot sale, but it turned out the firmware was too old and the cable to update it is surprisingly expensive, and the update itself not publicly available anyway.
I live in a pretty safe area and it rarely has false alarms or anything else I really need to monitor. I always fancied adding Ethernet to my home Alarm system, even though I don’t have any particular use for it.