AERCO Modbus Communications Manual - Manual (Page 84)

GF-114
MODBUS
Communication
Chapter 6
OMM-0035_0C USER MANUAL C-More/BMS II/ACS Software Setup
Page 84 of 200 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph.: 800-526-0288 05/18/12
CHANGE, ▲ and ▼ arrow keys, select the appropriate baud rate being used on the
Modbus Network. Press the ENTER key to store the selected baud rate.
6. Scroll to the MODBUS ADDRESS option in the RS232 MENU. Using the CHANGE key,
and the ▲ and ▼ arrow keys, select the desired address for the BMS II/ACS on the
Modbus Network. When the address is selected, press the ENTER key to store the
address in memory.
7. Next, scroll to the NETWORK TIMEOUT option in the RS232 MENU. Press the CHANGE
key and then select the maximum allowable time (in seconds) for the EMS (or BAS) to
refresh the Remote Setpoint information being sent to the BMS II/ACS. AERCO
recommends that a time be selected that is at least 3 times the normal refresh rate. This
will allow for the loss of 1 or 2 transmissions without timing out. This completes the
required entries in the RS232 MENU.
8. Press the MENU key and enter the FIELD ADJUST MENU.
9. Using the ▲ and ▼ arrow keys, scroll through the FIELD ADJUST MENU until the HDR
SET MODE option is displayed.
10. If REMOTE SETPT is not shown in the second line of the display, press the CHANGE
key and toggle the display to REMOTE SETPT.
11. Press the ENTER key to store the REMOTE SETPT setting.
12. While still in the FIELD ADJUST MENU, scroll to the REMOTE SIGNAL option.
13. If MODBUS is not shown in the second line of the display, press the
CHANGE key and
toggle the display to MODBUS.
14. Press the ENTER key to store the setting.
15. This completes all required menu entries for this mode.
The BMS II/ACS is now programmed for Remote Setpoint Operation from an EMS Master. In
the event of a Modbus signal interruption, AERCO recommends that the FAIL SAFE MODE
setting in the (CONFIGURATION MENU) be set to CONSTANT SETPT if you want the BMS II to
continue running the Boilers in the CONSTANT SETPT Mode. In this case, ensure that the
INTERNAL SETPT (Field Adjust Menu) is set to the desired setpoint temperature.
6.4 BMS II/ACS SETUP AS MASTER TO C-MORE BOILER
CONTROLLERS
To set up the BMS II/ACS as a Master to control C-More Boiler Slaves, options must be set in
the RS485 Menu as follows:
1. Using the MENU key on the BMS II/ACS front panel, select the RS485 MENU.
2. Scroll through the RS485 Menu and select the RS485 BAUDRATE option. The second
line of the display will show the currently selected RS232 Baud Rate (2400, 4800, 9600
or 19200).
3. If 9600 is not displayed, press the CHANGE key.
4. Using the ▲ and ▼ arrow keys, scroll through the menu option choices until 9600 is
displayed.
5. With a RS485 Baud Rate of 9600 displayed, press the ENTER key to store the setting in
memory.