Communications wiring
RTU Open v5
CARRIER CORPORATION ©2019
Integration Guide
All rights reserved
7
In the above example, MAC address 16 knows to pass the token back to MAC address 1, instead of counting up to
MAC address 127. Each MS/TP master node on the network must have their Max Masters set to this same value.
The default is 127.
Max Info Frames
- defines the maximum number of responses that will be sent when the RTU Open receives the
token. The default is 10 and should be ideal for the majority of applications. In cases where the RTU Open is the
target of many requests, this number could be increased as high as 100 or 200.
NOTES
BACnet MS/TP networks can be comprised of both master and slave nodes. Valid MAC addresses for master
nodes are 0 – 127 and valid addresses for Slave nodes are 0 - 254.
If the third party attempts to communicate to the controller but does not get a response, make sure the
controller is set as a BACnet MS/TP (m) master. The BACnet software asks the controllers, “Who Is?” This is
to auto-locate devices on the network. Only controllers set as masters will answer this request.
See Appendix A for Network Points List.
See
Appendix B
(page 55) for the BACnet Protocol Implementation Conformance Statement (PICS).
To set the Device Instance number or adjust the Max Masters or Max Info Frames using an Equipment Touch
1
In the Equipment Touch interface, navigate to the
Properties Menu
screen and click
Login
.
NOTE
The following graphic is generic and not specific to your system.
2
Type
Touch
for the password and click
Done
.
