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RESET
NGC-40 BRIDGE MODULE
Ethernet
Ethernet
To upstream
device
To upstream
device
RS-232
RS-232
Local RS-232
to Laptop
Local RS-232
to Laptop
Local RS-232 (COM 3) & Ethernet
Switch Setting RS-232
User Interface – Configuration Switch
A slide switch is provided on the front of the module to allow
the user to set the bridge into a known state for configuration
of the communication ports, as shown in the following table:
Switch Position
Bridge
Module Settings
SET
Configuration mode
RUN
Normal operating
mode
Modbus address
1
Settings based on the
user configuration
parameters
Local RS-232
Protocol
RTU
Data rate
9600 baud
Data bits
8
Stop bits
2
Parity
No parity
COM 1 In
COM 1 In
11
55
99
++
––
RESET
NGC-40 BRIDGE MODULE
Field
terminal
block
Field
terminal
block
COM 2 In
COM 2 In
33
77 11
11
++
––
++
––
++
––
Earth grounding
bar located at the
bridge module
Earth grounding
bar located at the
bridge module
Earth grounding
bar located at the
bridge module
Earth grounding
bar located at the
bridge module
To upstream
device
To upstream
device
To upstream
device
To upstream
device
RESET
NGC-40 BRIDGE MODULE
COM 1 Out
COM 1 Out
22
66 10
10
++
––
COM 2 Out
COM 2 Out
44
88 12
12
++
––
120 ohm
termination
resistor
120 ohm
termination
resistor
120 ohm
termination
resistor
120 ohm
termination
resistor
Field
terminal
block
Field
terminal
block
Earth grounding
bar located at the
bridge module
Earth grounding
bar located at the
bridge module
Earth grounding
bar located at the
bridge module
Earth grounding
bar located at the
bridge module
Wiring for Com 1 & Com 2 must be terminated on a panel
mounted terminal block. No ground wires should be
terminated on terminals 9 & 11. Terminate Com shields
at the panel mounted field terminal block chassis ground.
The Com cable shield from the field terminal block to the
Bridge should be terminated at the earth ground bar.
Wiring for Com 1 & Com 2 must be terminated on a panel
mounted terminal block. No ground wires should be terminated
on terminals 10 & 12. Terminate Com shields and 120 Ω
termination resistors (included) at the panel mounted field
terminal block as shown. The Com cable shield from the field
terminal block to the Bridge should be terminated at the earth
ground bar.
RS-485 Connection Diagrams – European Installation Technique
COM 1&2 Connections (In)
COM 1&2 Connections (Out) and RS-485 Termination Resistor
