Form: 2405
Universal Communication Gateway Reference Manual
Date: 01-25-2019
Revision: 8
Bryan Steam LLC, 783 North Chili Avenue, Peru, IN 46970
Web:
Phone:
765.473.6651
Fax:
765.473.3074
E-mail:
11
3.1.7
PRECISION DIGITAL
TRIDENT PD765 PANEL
METER
Use shielded cable to connect terminals
DO,
DO
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,
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I
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and DI of the PDA7422 Trident
RS-485 Serial Adapter to terminals J3-
1(GND), J3-2(-), and J3-3(+) of the UCG-PCB
WD-856 inside the UCG. Connect the
PDA7420 modular cable to the serial port of
the meter and adapter.
Figure 13 - Precision Digital Trident PD765 to UCG Connection
3.1.8
BOILERS EQUIPPED WITH
BRYAN STEAM PRINTED
CIRCUIT BOARD (WD-857)
Boilers equipped with a Bryan Steam
Communication PCB (WD-857) can be
interconnected using the two RJ45 jacks
installed on the board. Standard CAT5 cable
wired as T-568A or T-568B straight through
can be used for the interconnection
between the devices that are factory wired
to the Bryan Steam Communication PCB
(WD-857) and P1 of the UCG-PCB WD-856
inside the UCG.
The Bryan Steam Communication PCB does
not need to be wired in sequential order as
this will be handled in the device
addressing.
Figure 14 - Bryan Steam Communication PCB (WD-857) and Multi
Boiler Connection
3.1.8.1
END OF LINE TERMINATION
SWITCH
Long RS-485 cabling runs of 20ft. or more
should be properly terminated at each end.
If needed a
120Ω terminating resistor
should be between J3-7 and J3-8 of the
UCG-PCB WD-857 on each end of the trunk
(See Figure 12, Boiler #3). If the UCG is
placed at one of the ends of the trunk, the
blue RS-485 End-of-Line Terminating switch
inside the UCG will need to be moved to the
ON position. Remove the cover of the
ProtoNode and move the Modbus RS-485
EOL Switch to the ON position.
