AERCO Modbus Communications Manual - Manual (Page 85)

Chapter 6
MODBUS
Communication GF-114
C-More/BMS II/ACS Software Setup USER MANUAL OMM-0035_0C
05/18/12 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288 Page 85 of 200
6. Continue scrolling through the RS485 MENU until MIN SLAVE ADDR is shown in the
display.
7. If 000 is not displayed in the second line of the display, press the CHANGE key. Use the
▼ arrow key to set the MIN SLAVE ADDR to 000.
8. Press the ENTER key to store the 000 address in memory.
9. Scroll through the RS485 MENU until MAX SLAVE ADDR is shown in the display.
10. If 000 is not displayed in the second line of the display, press the
CHANGE key. Use the
▼ arrow key to set the MAX SLAVE ADDR to 000.
11. Press the ENTER key to store the 000 address in memory.
12. Next, scroll to the NUMBER OF NETW BLRS option. The second line of the display will
show the current number of Network Boilers currently stored in memory.
13. Press the CHANGE key and set the correct number of NETW BOILERS.
14. Press ENTER to store the number of Boilers on the Network.
15. Scroll to the MODBUS CNTL TYPE and ensure it is set to ROUND ROBIN (default). The
only other setting available for this option is BROADCAST which is not available at this
time.
NOTE
The remaining steps in this setup procedure involve assigning
separate and distinct addresses for each Boiler on the Modbus
Network. The valid address range is from 001 through 127.
16. While still in the RS485 MENU, scroll to NETW BOILER 01. The second line of the
display will show ADDRESS = 001 which is the default address for Network Boiler 1. If
desired, this address can be changed to any other value within the valid range (001 to
127).
17. Repeat step 16 for each additional C-More Boiler being controlled on the BMS II/ACS
RS485 loop. Do Not count Boilers or Water Heaters that will only be monitored on the
Modbus Network. Only count Boilers that will be controlled by the BMS II/ACS using the
Modbus connection.
18. This completes programming for the BMSII/ACS RS485 Network.
The BMS II/ACS is now programmed to control the Networked Boilers The BMS II/ACS will
automatically detect any C-More Boiler that is programmed for Network Control as follows:
• Boiler Mode = Direct Drive
• Remote Signal = Network
• Comm Address = Matches one of the NETW BOILER addresses stored in the BMS
II/ACS.