Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 756

Hayes Modem AT Command Protocol
The Hayes Modem AT Command Protocol is used to make various settings or control remotely a Hayes
modem connected to the Serial Communications Unit/Board via RS-232C cable.
Protocol Configuration
The configuration of the Hayes Modem AT Command Protocol is shown below.
Sequence Communications
No. sequence name
550 (0226) Initialize modem
(general-purpose)
560 (0230) Initialize modem
570 (023A) (specialized)
580 (0244)
561 (0231) Dial
571 (023B)
581 (0245)
552 (0228) Password
553 (0229) Data send/receive
(general purpose
sequence)
554 (022A) Escape
555 (022B) Hang up
562 (0232) Initialize and dial
572 (023C)
582 (0246)
590 (024E) Escape to hang up
Note 1. Refer to sequences No. 561, No. 571, and No. 581 for dialing operations.
2. Ladder Interface Settings
YES: User settings are required for the 3rd and 4th operands of PMCR(260).
NO: Send word allocation:
Receive word allocation:
3. The hexadecimal equivalents of sequences numbers are given in parentheses.
Appendix Q
Function
Initializes the modem connected to the
Serial Communications Unit/Board. The ini-
tialization command is set in the words
specified for the second operand of
PMCR(260).
Initializes certain OMRON Modems.
Dials from the modem connected to the
Serial Communications Unit/Board. AT
commands and telephone numbers are set
set in the words specified for the 3rd oper-
and of PMCR(260). This sequence can be
used only for certain OMRON modems.
After the line is connected, the password
sent from the other exchange is verified to
confirm that the line is connected to the
desired exchange. The normal value of a
password is set in the words specified for
the 3rd operand of PMCR(260).
Sends arbitrary data to the exchange which
the line is connected. Send data is set in the
words specified for the 2nd operand of
PMCR(260). Receive data is stored in the
words specified for the fourth operand of
PMCR(260).
Shifts the modem to escape mode (the con-
dition in which command input is available
during data communications). The escape
code is fixed to "+++"
After shifting to escape mode, the line is
disconnected.
Executes continuously from initialization to
dialling operations for certain OMRON
Modems.
Executes continuously from shifting to the
escape mode to hanging up.
Set the constant 0000 for the 3rd operand (S).
Set the constant 0000 for the 4th operand (D).
Ladder interface
Send word Receive word
allocation allocation
Yes No
No No
Yes No
Yes No
Yes Yes
No No
No No
1 No
Yes*
No No
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