Omron CJ1W-SCU41, Operation Manual

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Appendix N
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.
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: Set the constant 0000 for the 3rd operand (S).
Receive word allocation: Set the constant 0000 for the 4th operand (D).
3. The hexadecimal equivalents of sequences numbers are given in parentheses.
Sequence
No.
Communications
sequence name
Function Ladder interface
Send word
allocation
Receive word
allocation
550 (0226) Initialize modem
(general-purpose) 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). Yes No
560 (0230)
570 (023A)
580 (0244) Initialize modem
(specialized) Initializes certain OMRON Modems. No No
561 (0231)
571 (023B)
581 (0245) Dial 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. Yes No
552 (0228) Password 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). Yes No
553 (0229) Data send/receive
(general purpose
sequence) 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). Yes Yes
554 (022A) Escape Shifts the modem to escape mode (the con-
dition in which command input is available
during data communications). The escape
code is fixed to “+++” No No
555 (022B) Hang up After shifting to escape mode, the line is
disconnected. No No
562 (0232)
572 (023C)
582 (0246) Initialize and dial Executes continuously from initialization to
dialling operations for certain OMRON
Modems.
Yes*
1
No
590 (024E) Escape to hang up Executes continuously from shifting to the
escape mode to hanging up. No No