Modbus Read, Write and Override Parameters plus Exception Codes 
3/07  UDC3500 Universal Digital Controller Product Manual  389 
Parameter 
 
Register 
Address 
Data 
Type 
Access  Data Range or 
Enumerated Selection 
Description  ID  Hex  Decimal       
Input Algorithm 1 
Input A Selection 
(used with ID 204 
math 
calculations) 
205  00CD  205  INT  R/W  0 = Input 1 
1 = Input 2 
2 = Input 3 
3 = Input 4 
4 = Input 5 
5 = Loop 1 Output 
6 = Loop 2 Output 
7 = Input Algorithm 1 
8 = Input Algorithm 2 
Input Algorithm 1 
Input B Selection 
(used with ID 204 
math 
calculations) 
206  00CE  206  INT  R/W  0 = Input 1 
1 = Input 2 
2 = Input 3 
3 = Input 4 
4 = Input 5 
5 = Loop 1 Output 
6 = Loop 2 Output 
7 = Input Algorithm 1 
8 = Input Algorithm 2 
Input Algorithm 1 
Input C Selection 
(used with ID 204 
math 
calculations) 
207  00CF  207  INT  R/W  0 = None 
1 = Input 1 
2 = Input 2 
3 = Input 3 
4 = Input 4 
5 = Input 5 
6 = Loop 1 Output 
7 = Loop 2 Output 
8 = Input 1 Algorithm 
9 = Input 2 Algorithm 
Algorithm1 bias  92  005C  092  FP  R/W  -999.0 to 9999 in 
Engineering Units 
Percent Carbon 
Monoxide 
203  00CB  203  INT  R/W  0 = Manual 
1 = On Line (via Input 3 
only) 
Percent Carbon 
Monoxide Value 
46 
 
002E  046  FP  R/W  0.02 to 0.350 
Atmospheric 
Pressure 
24  0018  024  FP  R/W  590 to 760 
Percent 
Hydrogen 
34  0022  034  FP  R/W  1 to 99 (% H2)