Welcome to the new Schneider Electric Community

It's your place to connect with experts and peers, get continuous support, and share knowledge.

  • Explore the new navigation for even easier access to your community.
  • Bookmark and use our new, easy-to-remember address (community.se.com).
  • Get ready for more content and an improved experience.

Contact SchneiderCommunity.Support@se.com if you have any questions.

Close
Invite a Co-worker
Send a co-worker an invite to the Exchange portal.Just enter their email address and we’ll connect them to register. After joining, they will belong to the same company.
Send Invite Cancel
84756members
354188posts

UNIFLAIR BREC1812 - Not Communicating over ModBus RTU

APC UPS Data Center & Enterprise Solutions Forum

Schneider Electric support forum for our Data Center and Business Power UPS, UPS Accessories, Software, Services, and associated commercial products designed to share knowledge, installation, and configuration.

Solved
BillP
Administrator Administrator
Administrator
0 Likes
1
238

UNIFLAIR BREC1812 - Not Communicating over ModBus RTU

This question was originally posted by Waleed on APC forums on 6/20/2016


Dear All,

We have installed BREC1812 UNIFLAIR Chillers in one of our project, we have installed ACAC76123 Serial Cards to communicate over RTU for our BMS System, however we are not able to communicate over the RTU, we have already configured ModBus Parameters for both Chillers.

Can someone please help us in identifying this issue.

Regards,

Waleed


Accepted Solutions
BillP
Administrator Administrator
Administrator
0 Likes
0
238

Re: UNIFLAIR BREC1812 - Not Communicating over ModBus RTU

This reply was originally posted by L2SupportServices-Cooling on APC forums on 6/20/2016


Hello Waleed.

There are only a couple parameters on the unit to set for the Modbus.

SETTING TRANSMISSION PARAMETERS FOR SUPERVISION
The following screen allows the basic parameters to be set (first three lines) for
switching via supervision, i.e.
1. serial address of the unit connected to the serial supervision network
(must match serial address set in supervision programme);
2. data transfer rate (Ser. speed): 1200, 2400, 4800, 9600 and 19200 for
RS-485. (keep this at 9600 or 19200.
3. protocol type (standard or Modbus). (would be modbus in this case)

Some other things to try is to swap the wires on the card. Check is a resistor is needed at the end of the modbus chain. Try changing the parity on the Master to see if the values start reading. If these do not work, please call your local tech support to further troubleshoot the machines.

Thank you

See Answer In Context

1 Reply 1
BillP
Administrator Administrator
Administrator
0 Likes
0
239

Re: UNIFLAIR BREC1812 - Not Communicating over ModBus RTU

This reply was originally posted by L2SupportServices-Cooling on APC forums on 6/20/2016


Hello Waleed.

There are only a couple parameters on the unit to set for the Modbus.

SETTING TRANSMISSION PARAMETERS FOR SUPERVISION
The following screen allows the basic parameters to be set (first three lines) for
switching via supervision, i.e.
1. serial address of the unit connected to the serial supervision network
(must match serial address set in supervision programme);
2. data transfer rate (Ser. speed): 1200, 2400, 4800, 9600 and 19200 for
RS-485. (keep this at 9600 or 19200.
3. protocol type (standard or Modbus). (would be modbus in this case)

Some other things to try is to swap the wires on the card. Check is a resistor is needed at the end of the modbus chain. Try changing the parity on the Master to see if the values start reading. If these do not work, please call your local tech support to further troubleshoot the machines.

Thank you