Camus ProtoNode Start-up Guide
Page 27 of 87
4.7 Serial Network (FPC-N34): Wiring Field Port to RS-485 Network
•
Connect the RS-485 network wires to the 3-pin RS-485 connector on ProtoNode as shown below
o
Use standard grounding principles for RS-485 GND
•
See
for information on connecting to an Ethernet network.
•
If the ProtoNode is the last device on the trunk, then the end of line (EOL) termination switch needs
to be enabled.
See
for the orientation of switch positions referenced below.
o
The default setting from the factory is OFF (switch position = right side)
o
To enable the EOL termination, turn the EOL switch ON (switch position = left side)
•
If more than one RS-485 device is connected to the network, then the field bias resistor switch
needs to be enabled to ensure proper communication.
See
for the orientation of switch
positions referenced below.
o
The default factory setting is OFF (switch position = right side)
o
To enable biasing, turn the bias switch ON (switch position = left side)
NOTE: Biasing only needs to be enabled on one device. The ProtoNode has 510 ohm resistors
that are used to set the biasing.
BMS
Wiring
ProtoNode
Pin #
Pin
Assignment
RS-485 +
Pin 1
RS-485 +
RS-485 -
Pin 2
RS-485 -
-
Pin 3
RS-485 GND
Bias Resistor Switch
End of Line Switch
Figure 14: RS-485 EOL & Bias Resistor Switches
Figure 13: Connection from ProtoNode to RS-485 Field Network
G
-
+
