User`s manual

(b) Precautions for selecting a modem

• When using a cellular phone

A modem with the error correction function of MNP class-10 is recommended. However, note that

communication may not be established depending on the line condition.

• Modem setting

• Set the modem on the Q series C24 side as shown below:

*1 When using different modems, the slower communication rate will be in effect.

*2 Some modems may transmit one character as 10 bits.

Check the modem specifications when setting the Q series C24 transmission specifications.

*3 Some modems may switch the communication rate following the start of data communication.

Since the Q series C24 cannot switch the communication rate, set the modem side so that its communication rate does

not switch.

• When using a modem whose DR terminal (signal) is set by a switch, set the DR-terminal (modem output)

switch level to high. When using a modem requiring DR terminal setting with software, write the command

that turns on the DR (DSR) signal into the data for initialization. Set the "Modem initialization time DR

signal valid/invalid designation" to "Invalid" during modem function system settings with GX Configurator-

SC.

Setting item Setting range

Communication rate

Depends on the modem in use

Modem command Hayes AT command

SI/SO control None

Communication method No procedure

Data format

Data bit

Match the Q series C24

*2*3

Stop bit

Parity bit