The Muxpad II is a Data Gathering Module (DGM), which is a part of the Digitize System 3505 Multiplex Alarm Monitoring System. For a complete operating System, you also need a System 3505 with the MULTIPLEX option. The standard communications format for the multiplex System is an isolated RS-422/485 driver. Other available line drivers include RS 232, Audio, Fiber Optic, Polling Radio and Ethernet.
The Muxpad II board contains an isolated RS-422/485 serial port, an RS-232 serial port, a 5-volt switching regulator, a single FORM C relay, a watchdog timer, full lightning protection on the RS-422/485 data line, and various support Systems (such as 128K EPROM), and zone measurement circuitry with ground fault detection.
The Muxpad II with 32-Zone EOL may also be used to monitor addressable fire alarm control panels (FACP). The Muxpad II collects the supervised messages from the FACP serial printer port. As each message is transmitted by the FACP, the Muxpad II, with 32-Zone EOL gathers the text and interprets it into a format usable by the System 3505. The new messages are then relayed to the System 3505 via the supervised RS-485 serial port to the Muxpad II.