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Paradox security system control units are one of the most used units. It can now be easily connected to Ethernet using Gnome TTL converter.
Here is a small how to...

Документация Этернетного термометра TME: Этернетный термометр с прямым присоединением к компьютерной сети. Измеряет температуры от -55 до +125 °C. Потребитель может наблюдать за актуальной температурой непосредственно со своего веб-браузера или мобильного телефона. При превышении установленных величин термометр умеет предупреждать потребителя е-майлом. Документация ТМЕ имеется в распоряжении для скачивания в секции Download здесь...

Take a look at our new USB to RS232 and RS485 converters. We have supplied thousands of units to our customers. SBxxx converters have proven reliable and our customers have never had it easier. Buy one too!

Rugged Industrial USB converters SBxxx are available in two versions:

• SB232: USB to RS232 converter
• SB485: USB to RS485 or RS422 converter 

RS232 Ethernet serial servers (GNOME232) with power isolation has a new connector. Power is now connected via a slip on terminal.
More info about GNOME232 isolated version...

Wiegand protocol converter to a serial port RS232 can also communicate with anti-vandal RFID reader and JA-80H keyboard by Jablotron. Are you upgrading your old system? Are you looking for a way to connect Wiegand via RS232? then Wie232 it the ultimate device for you!
More info about Wie232...