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Sending Explicit Messages Section 6-4
Class ID (Command)
Specifies the destination class ID for the explicit message.
Instance ID (Command)
Specifies the destination instance ID for the explicit message.
Service Data (Command, Response)
For a command, this parameter specifies the data defined by the service
code.
The reception data defined by the service code is returned in the response.
Number of Bytes Received (Response)
The number of bytes of data received from the destination (remote node)
node address onwards is returned.
Destination (Remote Node) Node Address (Response)
The remote node address of the response source is returned.
Error Code (Response)
The error code defined by the CompoNet Network is returned.
Description • SEND EXPLICIT MESSAGE sends an explicit message defined by Com-
poNet to a Slave Unit by another manufacturer and receives a response.
• Unlike other FINS commands, SEND EXPLICIT MESSAGE specifies the
CompoNet Master Unit at the local node for the destination in the
CMND(490) control code. The actual destination node is specified by the
destination node address in the SEND EXPLICIT MESSAGE command.
Be sure to set the Master Unit at the local node in the CMND(490) control
code. An error will occur if the Master Unit at another node is specified.
• When a CompoNet Master Unit receives an explicit message, it automati-
cally returns a response to the message.
6-4-2 Using CMND(490) to Send Explicit Messages
With CS/CJ-series CompoNet Master Units, explicit messages can be sent
using a CMND(490) (DELIVER COMMAND) instruction in the ladder program
in the CPU Unit.
The command data for an explicit message is sent with FINS command code
2802 hex attached at the beginning.
An explicit message response is received after FINS command code 2802
hex and the FINS command end code.
[ CMND S D C ]
S: First command word
D: First response word
C: FINS command end code
Command data is set from the address specified for CMND(490) operand S
(first command word) onwards from the upper word to the lower word in the I/
O memory in the order of the command format.
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