12 Serial I/O / SNP / RTU Protocols
This chapter describes the VersaMax® CPU’s Serial I/O feature, which can be used to
control the read/write activities of one of the CPU ports directly from the application
program.
This chapter also contains instructions for using COMMREQs to configure the CPU
serial ports for SNP, RTU, or Serial I/O protocol.
• Configuring Serial Ports Using the COMMREQ Function
• Configuring Serial Ports Using the COMMREQ Function
− RTU Slave/SNP Slave Operation with a Programmer Attached
− COMMREQ Command Block for Configuring SNP Protocol
− COMMREQ Data Block for Configuring RTU Protocol
− COMMREQ Data Block for Configuring Serial I/O
• Serial I/O COMMREQ Commands
− Initialize Port
− Set Up Input Buffer
− Flush Input Buffer
− Read Port Status
− Write Port Control
− Cancel Operation
− Autodial
− Write Bytes
− Read Bytes
− Read String
Details of RTU and SNP protocol are described in the Serial Communications User
Manual (GFK-0582).
Serial I/O / SNP / RTU Protocols GFK-1503E User Manual 225
For public disclosure
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