You connect RP controller expansion modules to the RP controller room bus to provide the devices with power and communication from the controller.
Install the RP controller expansion module and connect a Cat 5 (or higher) unshielded, straight-through wired cable with eight conductors (four twisted pairs) to one of the two RJ45 receptacles on the module. Use a cable with the wire size (cross-sectional area) 22 to 26 AWG (0.34 to 0.14 mm²).
Connect the other end of the cable to the RP controller's RS-485 port that is configured for the room bus.
By default, the RS-485 Com B port is configured for the room bus.
When an additional RP controller expansion module is needed, install the device and connect the other end of the cable to the unused RJ45 receptacle on the previous module.
When connecting devices to the RP controller room bus through a daisy-chain configuration, the room bus ports on the device are interchangeable.
Repeat step 3 to install additional devices up to the maximum number of devices of the supported combination of RP controller expansion modules.
The maximum total number of devices and the restrictions that apply to the number of certain types of modules vary depending on the RP controller model. For more information, see RP-C Room Bus .For more information, see RP-V Room Bus .
Ensure that the rotary switch on each RP controller expansion module is configured to give the device a unique room bus address in the range supported by the RP controller model.
For more information, see Configuring the Room Bus Address for an RP Controller Expansion Module .
For more information, see Configuring the Room Bus Address for an RP Controller Expansion Sensor Module .For more information, see RP Controller Expansion Module Room Bus Addressing .