AERCO Modbus Communications Manual - Manual (Page 78)

GF-114
MODBUS
Communication
Chapter 5
OMM-0035_0C USER MANUAL C-More/BMS Software Setup
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display. Press the ▲ and ▼ arrow keys to set the required address for the BMS on the
Modbus Network.
5. Press the AIR TEMP key again until NETWORK TIMEOUT is shown in the top line of the
display. Press the ▲ and ▼ arrow keys to select the maximum allowable time (in
seconds) for the EMS (or BAS) to refresh the Remote Setpoint information being sent to
the BMS. 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.
6. Press the AIR TEMP key again until REMOTE SIGNAL is shown in the top line of the
display. Press the ▲ or ▼ arrow key to select MODBUS.
7. Press the FIELD ADJ key to exit the Field Adjust Mode. The yellow LED on the key
should go off.
8. To set the BMS for Remote Operation, press the CONFIG SYS key to enter the System
Configuration Mode. The red LED on the key will light.
9. Press the FIELD ADJ key until HDR SET MODE is shown in the top line of the display.
Press the ▲ and ▼ arrow keys to select REMOTE SET TEMP.
10. Press the CONFIG SYS key to exit the System Configuration Mode. The red LED on the
key will go off.
The BMS is now programmed for Remote Setpoint Operation from an EMS Master. In the event
of a Modbus signal interruption, AERCO recommends that the TEMP FAIL MODE setting be set
to Switch Inputs if you want the BMS to continue running the Boilers in the CONSTANT SET
TEMP Mode. In this case, ensure that the REF TEMP is set to the desired setpoint temperature.
5.4 BMS SETUP AS MASTER TO C-MORE BOILER CONTROLLERS
To set up the BMS as a Master to Control C-More Boiler Slaves, proceed as follows:
1. Press the FIELD ADJ key on the BMS front panel to enter the Field Adjust Mode. The
yellow LED on the key should be lit.
2. Press the HDR TEMP key until RS485 BAUDRATE is shown on the top line of the
display. Press the ▲ and ▼ arrow keys if necessary to set the baud rate to 9600.
3. Press the HDR TEMP key again until MIN SLAVE ADDR is shown in the display. Use
the ▲ and ▼ arrow keys to set the address to zero.
4. Press the HDR TEMP key again until MAX SLAVE ADDR is shown in the display. Use
the ▲ and ▼ arrow keys to set the address to zero.
5. Press the HDR TEMP key until NUMBER NETW BLRS is shown on the top line of the
display. Using the ▲ and ▼ arrow keys, set the number to the maximum number of C-
More Boilers that will be controlled on this Modbus Network.
NOTE
DO NOT count the C-More Boilers or Water Heaters that will only
be monitored on the Modbus Network. Only count the Boilers that
will be controlled by the BMS using the Modbus connection.
6. Press the HDR TEMP key until MODBUS CNTL TYPE is shown on the top line of the
display. Using the ▲ or ▼ arrow key, if necessary, set it to ROUND ROBIN.
7. Press the HDR TEMP key until NETW BOILER 1 is shown on the top line of the display.
Use the ▲ and ▼ arrow keys to set the address of the first Boiler being controlled on the