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4.1 Monitor And Control
4.1.1 General
The Modem uses a sophisticated microcontroller module to perform the monitor and
control functions of the modem. This module is referred to as the Monitor & Control
(M&C) (Figure 4-1). The M&C monitors the modem and provides configuration updates
to other modules within the modem when necessary. Modem configuration parameters
are maintained in battery backed RAM which provides for total recovery after a power
down situation. Extensive fault monitoring and status gathering is provided. All modem
functions are accessible through a local front panel interface and a remote
communications interface.
4.1.2 Description of Options
4.1.2.1 Remote Interface
All modem functions can be remotely controlled and monitored via a RS-485 (optional
RS-232C) communications link. The two wire, half duplex RS-485 interface makes it
possible to operate 255 modems on a common communications link. While the RS-232C
interface is used to communicate with a single Modem. The M&C module must be
hardware configured to one of the two interfaces.
RS-485 Configuration: To configure the M&C for RS-485 operation.
Install jumpers JP1, JP2, and JP3.
Remove jumpers JP4, JP5 and JPX.
Connect JP7 to RS485
MN/U-SDM309B Rev. #
M&C AND INTERFACES
Chapter 4.
4-4–1
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