User`s manual

Western Reserve Controls 1782-JDM User’s Manual
PUB 24.0
14
1.
Modbus Mode
: The JDM can operate in either the ASCII or RTU mode for Modbus
communications.
2.
Rx Data Length
: Maximum number of bytes expected from the remote Modbus device.
3.
Tx Data Length
: Maximum number of bytes to be sent to the remote Modbus device
4.
Modbus Baud rate
: The communications speed of the RS232 or RS485 link.
5.
DeviceNet Baud rate
: The selection of the baud rate is independent of any other
parameter.
6.
Modbus Timeout
: The amount of time the JDM waits for a command response from a
Modbus device before it declares an error due to a lack of response from the device. A
value of 0 indicates that this feature is not active.
7.
Output Fault Action
: Selection to determine whether each output will hold its last state or
transmit the Modbus string identified in the next parameter upon a device fault.
8.
Output Fault Value/String
: The message string the JDM will output after a Fault, if Fault
Value is selected above (hold last state is not selected). The default is a command to
Modbus address 0x01 with a Modbus command number 0x07, Read Exception Status.
9.
Output Idle Action
: Selection to determine whether each output will hold its last state or
transmit the Modbus string defined in the next parameter if an Idle Command is issued by
the Master.
10.
Output Idle Value/String
: The message string the JDM will output after an Idle
Command, if Idle Value is selected above (hold last state is not selected). The default is a
command to Modbus address 0x01 with a Modbus command number 0x07, Read
Exception Status.
11.
Serial Communications Framing Format
: Selects which format of communications
protocol is used, with the valid selection indicated.