I have a temperature alarm system in my office store room installed approximate 10 years ago by Siemens. This system gives a phone call to my mobile phone when the temperature goes above 25 degree Celsius. We have a dedicated land phone connection for this purpose. It stopped working a couple of days ago. I contacted Siemens, but they quoted me an unaffordable amount just for inspecting it (repair cost extra). So I want to repair it myself.
This system has an electronic mother board, which is connected to a modem (US robotics 56K message modem) through a 9 pin to 25 pin parallel cable (usually found in old printers). This modem is connected to a telephone line. I checked the telephone line with a normal phone and there is dial tone and I can make call from that (I have paid the bills). When I checked the modem all the lights are off. I planned to change the modem but shop keepers are telling me that this is model is discontinued and no longer available in the market. But one of the shop keepers told me that he can arrange it from abroad but for a very high price.
My question is that, do you think that simply changing the modem will help? Do modems need programming like we do with home internet routers? (If yes I can’t do it myself). Where do you think my mobile number is programmed? (on modem or on the Siemens controller).