Yokogawa JUXTA M Series Digital Limit Alarms MVTK - Manual (Page 49)

<5. MODBUS Communication >
5-3
IM 77J04J11-01E 1st Edition : 2006.08.25-00
5.1.2 Specifying D Registers
When you use a commercially available SCADA or the like or a user-created communica-
tion program, you must be careful when specifying D register numbers contained in mes-
sages because in both cases, you cannot use the original D register numbers as they are.
1) When using a commercially available SCADA or the like, specify D register numbers
by changing them into reference numbers. To change them into a reference number,
replace the D register number's leading character "D" with "4."
2) In a user-created communication program, specify a D register using the hexadecimal
number of the value obtained by subtracting "40001" from the D register's reference
number. (Specify this hexadecimal number.)
Example:
Specifying a value (alarm-1 setpoint [D0101])
1) For a messages using commercially available SCADA or the like, specify reference
number "40101."
2) For a messages in a user-created communication program, specify "0064," the
hexadecimal number of "100 ," which is obtained by subtracting 40001 from the
reference number.