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AERCO ADMS BAS Integration Manual
Modbus
®
Parameters
Modbus
®
Troubleshooting
Read=R Read/Write=R/W
If there is no communication, check the following:
• Check that the polarity on the Modbus
®
+ and – terminals is correct.
• Check that the Modbus
®
GND terminal is securely connected.
• Check that the Baud Rate on both devices are the same.
If the communication is intermittent, check the following:
• Check that the communication cable is of twisted pair type.
• Reliable communication depends on the cable length & Baud Rate used. Long cable length may
require a lower Baud Rate.
System Status Register
System Parameter Register
Product Information
Register Parameter Name
Read/Write Units
Type
Format
Range
1
DHW Target Max
R
°F
Input
U16
50 to 180°F
2
DHW Temp
R
°F
Input
U16
50 to 220°F
3
DHW Recirc Temp
R
°F
Input
U16
50 to 220°F
4
Hot Temp
R
°F
Input
U16
50 to 220°F
5
Cold Temp
R
°F
Input
U16
50 to 220°F
6
DHW Pressure
R
psi x 10
Input
U16
0 to 170 psi
7
DHW Recirc Pressure
R
psi x 10
Input
U16
0 to 170 psi
8
Hot Pressure
R
psi x 10
Input
U16
0 to 170 psi
9
Cold Pressure
R
psi x 10
Input
U16
0 to 170 psi
10
Valve Position
R
%
Input
U16
0 to 100%
11
Pump Status
R
on/off
Input
U16
0 = off, 1 = on
12
DHW Flow
R
gpm
Input
U16
0 to 160
13
DHW Recirc Flow
R
gpm
Input
U16
0 to 40
14
Energy Used
R
therms
Input
U16
0 to 65535
15
Error Code
R
Enum
Input
U16
See Error Code list
Register Parameter Name
Read/Write Units
Type
Format
Range
1
DHW Target
R/W
°F
Holding
U16
50°F to Target Max
Register
Parameter Name
Read/Write Units
Type
Format
Range
1
Model
R
Num
Input
U16
Product model - “1069”
2
Firmware Revision
R
Num
Input
U16
SVN revision
OMM-0126-0A
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