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J378 Modem
DATA SHEET
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The J378 Modem allows a J375 Modbus
@ Adapter to be used with a 4-wire, twisted pair, fully
shielded cable network.
FEATURES
Allows short-haul data transfer for in-
plant
Micro
84’” controller
Allows transmission over a 4-wire,
twisted pair cable
Designed for harsh industrial
environment
Low cost
Easy to install
Operates asynchronously at speeds up
to 19,200 bps
Uses frequency shift keying (FSK) to
maximize noise immunity
Tolerates a maximum signal loss of 35
dB
Operates in half-duplex transmission
mode
Does not require an additional power
supply
Monitors certain EIA control signals via
LEDs
Mounting and packaging similar to
Micro 84 l/O modules
Compatible with Gould J478 Modem
GENERAL DESCRIPTION
The J378 Modem allows a J375 Modbus
Adapter to be used with a 4-wire, twisted
pair cable network, when the cable is used
in a multipoint environment. It attaches to
the right side of the J375 and receives both
power and W-232-C signals from the
adapter. It connects to the 4-wire, twisted
pair cable by way of a terminal strip on the
front of the modem.
The J378 uses FSK modulation that is com-
patible with the J478 Stand-alone Modem.
The J378 meets or exceeds the specifica-
i
tions for the J478 Modem, except for voice
communications. The J378 does not have
voice communication capability.
The J378 attaches to the right side of the
J375 Modbus Adapter through the RS-232-C
port on the adapter. Attaching the modem
to the adapter dedicates the RS-232-C port
for use by the modem.
The J378 interfaces with the Modbus
twisted-pair cable network through four
terminals on the front of the modem. You
simply connect the twisted-pairs directly to
the terminals on the front of the unit. The
terminals are clearly marked as to which is
receive and which is transmit. The J378
supports the Modbus 4-wire, twisted pair
cable network only.
The J378 uses four LED indicator lights to
display operating status.
XMIT D (Transmit Data to cable)
RCV D (Receive Data from cable)
CD (Carrier Detect from cable)
RTS (Request to Send from J375
Adapter)
1
=!!!!!! GOULD
Nectronics
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