Concept
Communication Ports on RP-C Models with “-M” in the Product Name
The RP-C provides the following communication ports:
One RS-485 port with RJ45 interface
One RS-485 port with terminal block
This applies to the following RP-C models with “-M” in the product name:
RP-C-12A-M-24V, RP-C-12B-M-24V, and RP-C-16A-M-24V
RS-485 Port with RJ45 Interface
The RS-485 port is labeled:
RS-485 Com A
The RS-485 Com A port is rated 3 W (24 VDC).
The RS-485 Com A port is an RJ45 port. For more information, see RJ45 Pinout for the RS-485 Port(s) of the RP-C Controllers .
The RS-485 Com A port can be configured to use one of the following two communication protocols for different types of networks:
Sensor bus
Modbus
An RP-C can have only one of each network type.
The sensor bus is designed for communication with SpaceLogic Sensor devices. For more information, see RP-C Sensor Bus .
The Modbus (RTU) network can be used for communication with standard Modbus devices. For more information, see RP-C Modbus .
Default configuration:
Sensor bus on the RS-485 Com A port
For more information, see Communication Port Wiring .
For more information, see Allocating Flexible Ports .
RS-485 Port with Terminal Block
The RS-485 port with screw terminal block is used for connection to the BACnet MS/TP (RS-485) network.
The screw terminals are labeled:
RS-485+
RS-485–
Shield
For more information, see RP-C-12A-M-24V Screw Terminals .
For more information, see RP-C-12B-M-24V Screw Terminals .
For more information, see RP-C-16A-M-24V Screw Terminals .
For more information, see RS-485 Communications .
Hardware Overview
RP-C Communication Ports
RP-C Controllers
RP-C Sensor Bus
RP-C Modbus
RJ45 Pinout for the RS-485 Port(s) of the RP-C Controllers
Allocating Flexible Ports
RP-C-12A-M-24V Screw Terminals
RP-C-12B-M-24V Screw Terminals
RP-C-16A-M-24V Screw Terminals
RS-485 Communications