PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 6
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 144
Modem responded with NO DIALTONE. Modem is
unable to complete the requested connection. Check
the modem connections and the telephone line.
Modem responded with ERROR. Modem is unable to
complete the requested command. Check the modem
command string and modem.
Modem responded with RING, indicating that the
modem is being called by another modem. Modem is
unable to complete the requested command. Retry the
modem command later.
Unknown response received from the modem. Modem
unable to complete the request. Check the modem
command string and modem. Response should be
CONNECT or OK.
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)
6.2.5 Overlapping COMMREQs
Some Serial I/O COMMREQs must complete execution before another COMMREQ can be
processed. Others can be left pending while others are executed.
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