Modbus, Communication, Gf-114 – AERCO Modbus Communications Manual User Manual
Page 17
Chapter 2
MODBUS
Communication
GF-114
Standard Register Assignments
USER MANUAL
OMM-0035_0C
05/18/12 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Page
17 of 200
2.2.2 C-More Boiler Controller Standard Holding Register Assignments
The Read/Write Input Register address assignments are listed in Table 2-2 which follows.
Unless otherwise specified, all Holding Register menu items are Read/Write (R/W)
Table 2-2: C-More Controller Standard Holding Register Address Mapping
Modbus Data
Address
Decimal (Hex)
Menu Item
Units and Range
Comments
0 (0x0000)
Net Remote Set
Point
DEGREES_1 (0 to 1000)
See Appendix A,
Tables A-2 and A-3 for
Conversions. R/W ONLY in
Remote Set Point Mode
1 (0x0001)
Net Direct Drive
% (0 to 100)
Normally Read Only. R/W
ONLY in Direct Drive Mode.
2 (0x0002)
Modbus Password int (0 to 65535)
Default = 0
3 (0x0003)
Password
int (0 to 65535)
Default = 0
4 (0x0004)
Internal Set Point
DEGREES_1 (0 to 1000)
See Appendix A,
Tables A-2 and A-3 for
Conversions
Default = 130°F
5 (0x0005)
(Reserved)
6 (0x0006)
Time
Int (0 to 1439)
1count/min
7 (0x0007)
Date
int (0 to 65535)
1count/day
Date count starts with Jan.
1, 2000. For Example: Jan.
1 2001 would equal 365
counts
8 (0x0008)
Unit of Temp
bool (0, 1)
0= Degrees Fahrenheit (°F)
1=Degrees Celsius (°C)
Default = °F
9 (0x0009)
Baud Rate
enum (0, 1, 2, 3, 4)
0 = 2.4k
1 = 4.8k
2 = 9.6k
3 = 19.2k
For C-More RS232 port
ONLY
Default = 2 (9.6k)
10 (0x000A)
Unit Type
bool (0, 1)
0 = Boiler
1 = Water Heater
Default = Boiler
11 (0x000B)
Unit Size
enum (0, 1, 2, 3, 4, 5)
0 = 0.5 MBTU
1 = 1 MBTU
2 = 1.5 MBTU
3 = 2 MBTU
4 = 2.5 MBTU
5 = 3 MBTU
Default = 1 (1 MBTU)