Messenger Modem
®
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Description
The Mercury Instruments Messenger Modem is a single channel, battery-operated, 1200/
2400 baud, analog modem designed for the harsh environments of the natural gas industry.
The modem board may be ordered with or retrofitted to existing Mini-AT, Mini-Max,
ECAT, ER, Sentry and ERX instruments. The modem is also included as an integral part
of a standard Mercury Pulse Accumulator. Since the Messenger Modem requires very
little power, it shares power from the instrument’s battery pack. Instruments connected to
a Messenger Modem may be called by host computer software (usually MasterLink or
AutoLink) to remotely retrieve data, or the modem can call into host computer systems
that can answer and process incoming calls, such as Alarm-Link.
The Messenger Modem can also be installed into a separate enclosure as a stand-alone
modem assembly. Modem assemblies may also include safety barriers for pulse data,
serial data and/or instrument power. Various power supply options are available for the
modem assemblies and include; alkaline or lithium batteries, AC power and solar panels.
On-board DIP switches provide local configuration of various parameters, such as;
• Select carrier speed: 1200 or 2400 baud
• Enable or Disable: Line Share/Line Surrender
• Enable or Disable: Answer Incoming Calls/Do Not Answer
• Enable or Disable: Wake-up on 1 Ring/ Wake-up on User Defined Rings
• Enable or Disable: Wake-up on Serial Data/Do Not Wake-up
• Enable or Disable: Modem Configuration/Serial Pass thru
• Select serial mode: RS-232 or CMOS
In addition, the S-Registers may be modified via the use of the Mercury Messenger Con-
figuration Software.
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