Echelon SmartServer 2.2 - Manual (Page 284)

SmartServer 2.2 User’s Guide 285
that the Modicon Mode check box in the Modbus Address Display
Property in the Global Settings dialog is cleared (to access the Global
Settings dialog, click Settings). If the current and expected values do not
match, add 1 to the data point’s physical address. If the values still do not
match, subtract 1 from the data point’s physical address.
The Modbus driver is configured to ensure that the start and stop
addresses remain consistent with the Length property. This means that if
Length property is changed, the Start Address property is automatically
updated to fit the desired length. Similarly, if the Start Address is
changed, the Length property is updated accordingly.
This property is only displayed in Driver mode; it is not displayed in
General mode.
Length Displays the length of the data point. Enter a value and select whether it is
measured in bits or bytes. The default is 2 bytes.
This property is only displayed in Driver mode; it is not displayed in
General mode.
Modbus Data
Register Type
(Function #) Displays the data access type of the Modbus device, which can be one of
the following values:

Coil Functions (Functions 1 & 5 single-write). For a single coil.
Single bit, read-write data that has two states (on/off).

Coil Functions (Functions 1 & 15 multi-write). For multiple coils.
Single bit, read-write data that has two states (on/off)

Discrete Input (Function 2). Single bit, read-only data that has two
states (on/off).

Input Register (Function 4). 16-bit read-only data that can be
interpreted as a numeric value, a bit map, or an ASCII character.

Hold Register (Functions 3 & 6 single-write). For a single register.
16-bit write data that can be interpreted as a numeric value, a bit map,
or an ASCII character.

Hold Register (Functions 3 & 16 multi-write). For multiple
registers. 16-bit write data that can be interpreted as a numeric value,
a bit map, or an ASCII character. This is the default.
This property is only displayed in Driver mode; it is not displayed in
General mode.
Device
Displays the name of the Modbus data point’s parent device.
Functional Block
Displays the name of the Modbus data point’s parent functional block.
Dp Displays the name of the Modbus data point. In Driver mode, you can
change the name. In General mode, this field is read-only.
Format Description Displays the data type (SNVT, UNVT, or built-in type) of the data point.
You can select one of the 19 SNVT, UNVT, or built-in types listed for the
Modbus data point.
This property is only displayed in Driver mode; it is not displayed in
General mode.
Unit Displays the units of measures used by the Modbus data point (for
example, speed, 1/10 Hz, 1/10 %). The unit string is defined in the