Autodial Function (4400) - Emerson PaCSystems VersaMax Series User Manual

User Manual
GFK-1503F
address +2
address +3
address +4
address +5
address +6
address +7
Operating Notes
This function does not update the status of words of the cancelled COMMREQs.
CAUTION
Failure to do so may result in injury to personnel or cause damage to the equipment. If this
COMMREQ is sent in either Cancel All or Cancel Write mode when a Write Bytes (4401)
COMMREQ is transmitting a string from a serial port, transmission is halted. The position
within the string where the transmission is halted is indeterminate. In addition, the final
character received by the device the CPU is sending to is also indeterminate.
12.4.10

Autodial Function (4400)

This feature allows the VersaMax CPU to automatically dial a modem and send a specified
byte string.
To implement this feature, the port must be configured for Serial I/O.
For example, pager enunciation can be implemented by three commands, requiring three
COMMREQ command blocks:
Autodial: 04400 (1130h) Dials the modem.
Write Bytes: 04401 (1131h) Specifies an ASCII string, from 1 to 250 bytes in length, to
send from the serial port.
Autodial: 04400 (1130h) It is the responsibility of the PLC application program to hang
up the phone connection. This is accomplished by reissuing the autodial command and
sending the hang up command string.
Serial I/O / SNP / RTU Protocols
VALUE VALUE
(decimal) (hexadecimal)
0008 0008
0000 0000
0000 0000
0000 0000
4399 112F
0001 0001
MEANING
Status word memory type (%R)
Status word address minus 1 (%R0001)
Not used
Not used
Cancel operation command
Transaction type to cancel
• 1 All operations
• 2 Read operations
•
3 Write operations
Chapter 12
Jan 2020
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