GE PACSystems RX7i - Serial I;O COMMREQ Commands

Chapter 6. Serial I/O, SNP & RTU Protocols
210 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD
6.2.4 Serial I/O COMMREQ Commands
The following COMMREQs are used to implement Serial I/O:
■ Local COMMREQs - do not receive or transmit data through the serial port.
 Initialize Port (4300)
 Set Up Input Buffer (4301)
 Flush Input buffer (4302)
 Read port status (4303)
 Write port control (4304)
 Cancel Operation (4399)
■ Remote COMMREQs - receive and/or transmit data through the serial port.
 Autodial (4400)
 Write bytes (4401)
 Read bytes (4402)
 Read String (4403)