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2 DATA COMMUNICATION USING PREDEFINED PROTOCOL
2.2 Communication Type of Protocols
2.2 Communication Type of Protocols
A send packet to the target devices and a receive packet from the target devices at the time of process execution are
registered in a protocol.
The packet elements which are set to the Predefined protocol support function is applied to the actual data portion of the
packet to be transmitted.
For details of packet elements, refer to the following section.
Page 35 Packet elements
Example of a packet configuration
With the Predefined protocol support function, communications with target devices are performed using the following
procedures (communication types).
For the operation of each operation type, refer to the following section.
Page 521 Operation Image and Data Structure of Predefined Protocol
Communication
type name
Processing
Send Only Sends a send packet once.
One send packet is required.
Receive Only Receives a packet if it matches any of up to 16 defined receive packets.
One or more receive packets are required.
Send & Receive Sends a send packet, and then receives a packet if it matches any of up to 16 defined receive packets.
One send packet and one or more receive packets are required.
Data area
Number of byte
to be read
Check codeHeader Station No. Command Read data Terminator
Maximum data length: 2048 bytes
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