Modbus Read, Write and Override Parameters plus Exception Codes 
4/07  UDC2500 Universal Digital Controller Product Manual  197 
Parameter 
Description 
Register 
Address 
Data 
Type 
Access  Data Range or 
Enumerated Selection 
  Hex  Decimal       
Lockout 
(keyboard only) 
Changes to data are 
always possible via 
communications 
regardless of this 
configuration. 
0084 132  INT  R/W 
0 = No Lockout 
1 = Calibration Locked out 
2 = +Configuration – Timer, 
Tuning, SP Ramp, 
Accutune are read/write 
3 = +View – Tuning and SP 
Ramp are read/write, no 
other parameters are 
available 
4 = Maximum Lockout 
Security Code  0050  080  INT  R/W 
0 to 9999 
Man/Auto Key 
Lockout 
00BF 191  INT  R/W 
0 = Disable 
1 =Enable 
Run/Hold Key 
Lockout 
00EE 238  INT  R/W 
0 = Disable 
1 =Enable 
Setpoint Key 
Lockout 
00ED 237  INT  R/W 
0 = Disable 
1 =Enable 
NOTE 1: Writes to these locations are not available when Accutune is enabled.