Watts AERCO EXT Installation, Operation & Maintenance Manual page 61

Ufly Controller and BCM for Modulex EXT
CHAPTER 7: BCM MODBUS AND ADDRESS ASSIGNMENTS
Table 7-4: BCM Standard Holding Register Address Mapping
Modbus Data
Menu Item
Address
AERCO BMS II/ACS
1 Requested
Modulation Level
Maximum
1017
Modulation Level
1004 Requested Setpoint
Heat Request
1021
Command
1023 Pump Control
1030 Error/Reset
1031 Run Counters Clear
Check Mode,
1041 Inserted burner
OMM-0159_A • 6/28/2022
Units and Range
CONTROL REGISTERS
% (0 to 100)
% (0 to 100)
32°F – 212°F (0°C – 100°C)
(Value x 10)
(0x01, 0x33, 0x44, 0x55,
0xBB, 0xCC, 0xEE)
0x01:
0x55:
0xBB:
0xCC:
0xEE:
If enum is none of the above,
Standby is selected.
enum (0, 1, 2)
0 = No action
1 = Switch OFF
2 = Switch ON
enum (0x5A)
enum (0x5A)
Bit 0: BMM #0 to
control
Bit 7: BMM #7
OPERATING DATA REGISTERS
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requests Run mode and
supersedes the value set for
Max Modulation Level
(Value x 2)
enum
No action
DHW mode
enabled
Space Heating
requested & DHW
enabled
Check request
Space Heating
request
Bit 0 (BMM #0) is auto-
Flags
matically set at Check Mode
(0 – 0xFF)
Default/(Comments)
(Read/Write)
A value other than 0
(address 0x03F9)
(Read/Write)
100° (50%)
(Read/Write)
180°F
(Read/Write)
0x01
(Read/Write)
(Read/Write)
(Read/Write)
(Read/Write)
start
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