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FEATURES
The SRM-6DC, Asynchronous
Short Range Modem, is used for local data distribution,
connecting asynchronous DTEs to other DTE devices. SRM-6DC
operates full or half duplex over 4-wire, or half duplex
over 2-wire twisted pair lines, ensuring integrity of data
transmission for distances up to 15 km (9.0 miles),
depending on the gauge and data rate.
- SRM-6DC complies with the RS-485
standard for multipoint environment. The modem's carrier
can be strapped to be constantly on, or controlled by the
RTS signal (Circuit 105). Operation with controlled
carrier enables connection of SRM-6DC in multipoint
configurations over 4 or 2-wires. Special circuitry for
isolating inactive transmit pairs of wires, and two strap
settings for high or low impedance of the receive circuit,
enable SRM-6DC to work properly in multipoint
configurations of up to 50 polled modems, without
reduction of distance. The controlled carrier can also be
used in applications that require passing a control signal
end-to-end. (RTS on one SRM-6DC is passed to DCD on the
other unit.) A unique circuit enables the user working in
2-wire half duplex to receive an echo from the modem even
if DTEs used do not have an echo option.
- Innovative circuitry allows SRM-6DC
to operate without connection to the mains supply.
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SPECIFICATIONS
- Asynchronous
- Data rates up to 38.4 kbps
- 4-wire full or half duplex
- Complies with RS-485 standard (multipoint
environment)
- Operates in multipoint with up to 50 DTEs
- Transmission range up to 15 km (9.0 miles)
- Strain relief for line cable
- No AC power required
- Compact, lightweight, easy to install
SRM-6DC/*/+
Async Multipoint Short Range Modem
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Specify:
F for female 25-pin connector
M for male 25-pin connector |
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Specify line interface:
RJ11 for RJ-11 jack
RJ45 for RJ-45 plug on 2m / 6 ft cable
RJ45S for RJ-45 socket |
ORDERING
SRM6DC/F
SRM6DC/F/IDC
SRM6DC/F/RJ11
SRM6DC/F/RJ45
SRM6DC/F/RJ45S
SRM6DC/M
SRM6DC/M/RJ11
SRM6DC/M/RJ45
SRM6DC/M/RJ45S
APPLICATIONS
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