Omron CQM1H-SCB41 Operation Manual page 424

Hayes Modem AT Command Protocol
Setting Example
When send data is THIS IS SAMPLE.
0009 0014 5448 4953
T H
Character string length of send data sent to modem (bytes)
Code length of PMCR when it is used (words)
A maximum of 200 bytes (including the CR) can be received. When the received data is RETURN OK, the con-
tent stored in the receive words is as follows:
0006 5245 5455 524E
R E T U R N
Length of received character string (words)
Note An error will occur is the reception data is not received within 90 seconds after the data is sent.
Escape Mode
Shifting to the escape mode can be made using sequence No. 554. No setting is necessary for this sequence.
Note The character string to shift the online mode to the escape mode (i.e., the escape code) is '+' for modem
settings.
Hang Up Command
The hang up command (to disconnect the line) can be executed using sequence No. 555. No setting is neces-
sary for this sequence.
Communication Errors
Three result codes are monitored after an AT command is sent to the modem. When a result code is returned,
it will be checked. If the code is not the normal result code ("OK", "CONNECT 9600/REL4", "CONNECT 2400/
REL4", in words), after a fixed time of waiting to send, the following retry processing will be repeated 2 times to
send the AT command again and waiting for another result code.
The receive monitoring time and send wait time for each sequence are shown below.
Sequence
No.
#550 Initialize modem (general-purpose)
#560 Initialize modem (specialized)
#570
#580
#561 Dial
#571
#581
#552 Password
#553 Data send/receive (general-purpose)
#554 Escape
#555 Hang up
#562 Initialize and dial
#572
#582
#590 Escape and hang up
2049 5320 5341
I S I S S A
204F 4B00
O K
Sequence name
4D50 4C45
M P L E
Receive monitoring time
10 s
10 s
90 s
None
90 s
10 s
10 s
90s
10 s
Appendix N
Send wait time for retries
1 s
1 s
90 s
3 s
None
1.5 s (after first try)
1.5 s (after first try)
Initializing: 1 s
Dialling: 90 s
1.5 s (after first try)
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