User`s manual

Western Reserve Controls 1782-JDM User’s Manual
PUB 24.0
6
How do I send a poll command to read data?
The poll command can read multiple Modbus Device status registers’ data per poll command, as supported
by the device, up to a limit of 100 bytes of data on the DeviceNet message. First, set up your scanner to
read the number of bytes of data expected from the JDM plus two (2), depending upon the command and
number of register data desired. The command response from the Modbus device is returned from the JDM
to the DeviceNet master in response to a poll command.
1.3.2 Explicit Messages
As mentioned explicit messages are typically used to read and write configuration data. See the DeviceNet
Specification for further information of the standard data available.
1.4 Default Device Configuration
The JDM DeviceNet address is read from the switches and is set to 63 at the factory. All other parameters
are software settable. The default settings for the JDM are provided in Section 3.6.
1.5 EDS
An EDS (Electronic Data Sheet), which describes the various parameters of the JDM, is shipped with your
device or is available on WRC’s web site: http://www.wrcakron.com/