Omron CQM1H-SCB41 operation manual Modem Settings

Hayes Modem AT Command Protocol Appendix N

Modem Settings

When this protocol is used, it is required that the modem connected to the Serial Communications Board be initial- ized to the following conditions:

Command echo	No
Result code display format	Numeric format
Speed display, busy/dialling tone detection at	Baud rate display enabled, busy and dialling tone
connection	detection enabled.
Error correction data compression display	Error correction/data compression display enabled
MNP setting	Error correction provided (auto-reliable mode)
MNP class setting	MNP class 4
V.42 compression, Error correction	Not enabled
Flow control between terminal modems	Not enabled
ER signal control	Always ON
Escape code	+

Note 1. It is recommended that, in addition to the above settings, the abort timer should be set so that commu- nications are cut off if a communications error happened due to incidents such as cable disconnection between the Serial Communications Board and modem. Set the abort timer to 10 minutes for the mo- dem initialization (specialized) (Sequence No. 560, 570, 580). Refer to modem’s manual for further in- formation about abort timers.

2.The data format of the modem (baud rate, data length, parity, stop bit) is set by AT commands issued from a device connected to the modem. Its settings should conform to communications conditions of the device which issues AT commands. Therefore when communications are made between the modem and Serial Communications Board, it is required that communications conditions should be set by issu- ing AT commands from the Serial Communications Board.

3.Modem settings become invalid if the power supply is turned off and must be set again. However, a memory backup function can be used to protect settings so that even after the power supply to the mo- dem is turned off, it can communicate with the previous setting conditions.

For Initialize Modem (specialized), the modem initialization command is built in as message data. However, for Initialize Modem (general-purpose), the command must be specified in PMCR.

Operand 1		#x550 (x: Communications port)
Operand 2		First address for storing initialization command character string C
Operand 3		None
C+0	Number of words from address set for operand 2 to end of data		4 digits BCD
C+1	Number of bytes for send data (initialization command)		4 digits BCD
C+2	Send data (initialization command)		ASCII

:(Fill data to left for odd numbers of bytes)

C+n

Setting Example for Modem Initialization Command

•MD24FB10V Using Sequence #550 (OMRON)

The following command is set in the words specified by the second operand of PMCR.

ATE0V0X4\V2\N3%C0*C0\X1&M0S26=10

0018

0032

A T E 0 V 0 X 4 \ V 2 \ N 3 % C 0 * C 0 \ X 1 & M 0 S 2 6 = 1 0

Character string length of modem initialization command (bytes)

Code length of PMCR when it is used (words)

Note Turn ON pin 4 of DIP switches SW3 on for this Modem (ER signal always ON).

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