
Appendix B: CRC-16 Calculation
02/13 Modbus® RTU Serial Communications User Manual 39
Address
(hex)
Register
(decimal)
Parameter Name Access Notes
0062 40099 Deadband R/W Floating Point
0064 40101 Reset #2 R/W Floating Point in Repeats/Minute or
Minutes/Repeat.
For loop #2 this cell is
UDC3300 Reset #4 or UDC3500 Reset #6
0066 40103 Rate #2 R/W Floating Point in Minutes
For loop #2 this cell is UDC3300 rate #4 or
UDC3500 rate #6
0068 40105 Cycle Time #2 R/W Floating Point in Seconds.
Read-only UDC2300, UDC3300.
For loop #2 this cell is UDC3300 Cycle Time #4
or UDC3500 Cycle Time #6
006A 40107 LSP #1 R/W Floating Point in Engineering Units.
006C 40109 LSP #2 R/W Floating Point in Engineering Units.
006E 40111 Alarm #2 SP #1 R/W Floating Point in Engineering Units. Note 2
0070 40113 Alarm #2 SP #2 R/W Floating Point in Engineering Units. Note 2
0072 40115 unused
0074 40117 SP Low Limit R/W Floating Point in Engineering Units.
0076 40119 SP High Limit R/W Floating Point in Engineering Units.
0078 40121 Working Set Point R/W Floating Point in Engineering Units.
On a write to this register the instrument
will update the proper set point according to
the loop’s currently selected set point.
NOTE: Use this register for operator set
point value changes ONLY. Use SP
Override for computer-generated set point
values.
DR4300, DR4500: READ ONLY
007A 40123 Output Low Limit R/W Floating Point in Engineering Units.
007C 40125 Output High Limit R/W Floating Point in Engineering Units.
007E 40127 Output Working Value R/W Floating Point in Engineering Units.
0080 40129 PV Override Value R/W Floating Point in Engineering Units.
UDC2300, UDC2500, UDC3200,
UDC3300, UDC3500 ONLY
0082 40131 SP Override Value R/W Floating Point in Engineering Units.
UDC2300, UDC2500, UDC3200,
UDC3300, UDC3500 ONLY
0084 40133 Output Override Value R/W Floating Point in Engineering Units.
UDC2300, UDC2500, UDC3200,
UDC3300, UDC3500 ONLY
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