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Yokogawa DX Serial Driver
Address Type
Format
Range
Data Type
Access
Unit String of Math Channel*
CHxx.unit
01-38
String
Read Only
Tagname of Math Channel*
CHxx.tag
01-38
String
Read Only
Status of Math Channel*
CHxx.status
01-38
String
Read Only
Lowest Math Channel*
CHA.Low
Short,
Word, Byte
Read Only
Highest Math Channel*
CHA.High
Short
, Word, Byte
Read Only
*Data associated with these addresses are only read from the device at the start of a communications
session. Once read, the values will not be refreshed until the server has been restarted or the "Reset" tag
has been invoked. To invoke a reset, a non-zero value must be written to the Reset tag. Once the Reset tag
has been invoked the driver will reinitialize all startup data from the device.
Alarm Setpoints
Data values for Alarm Setpoints that are undefined in the device will be returned as +INF. Data values can
only be written to Alarm Setpoints that are defined in the device. Write operations to undefined Alarm
Setpoints will return an error. Write operations are available only for users logged in at the Administrator
level and will return an error otherwise. Alarm setpoint values are read one channel at a time. For devices
with a large number of channels, increasing the scan rate of ASP items and/or reducing the number of active
ASP items will increase the read performance of the PV and alarm data.
Scales
Data values for Scale_Hi and Scale_Lo for channels that are skipped will be returned as +INF.
Tag Names
For devices that do not support tag names and channels that have unspecified tag names, the driver will
construct an internal tag name based on the channel number. For example, the tag name of address 'CH01'
will be returned as 'CH01'.
General Device Data
Address Type
Format
Range
Data Type
Access
Administrator Level*
Admin
Boolean
Read Only
Date of Last Data
Date
String
Read Only
Time of Last Data
Time
String
Read Only
Model Name of Device*
Model
String
Read Only
Math Communication Data*
CDxx
01-08
Float
Read/Write
Control Math Execution
MathControl
Short
, Word, Byte
Write Only
Reset Alarms
AlarmReset
Boolean
Write Only
Control Command and Response
Command
String
Read/Write
Previous Screen
PreScreen
Boolean
Write Only
Direct Reloading of Configuration
Reset
Boolean
Write Only
*The Admin address type has a value of '1' or 'true' when the user has logged on at the Administrator level
and a value of '0' or 'false' when the user has logged on at the User level.
Math Communication Data
The CD address type is only valid for devices equipped with the math option and write operations to CD
addresses for non-math equipped devices will return an error. Write operations are available only for users
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