User`s manual

CHAPTER 3 COMMUNICATIONS BY THE MODEM FUNCTION

3.3 Specifications

(2) Specification and precautions for the connectable TA's (terminal adapters)

(a) TA specification

*1 TA's that turn on the CD (DCD) signal simultaneously cannot be used.

Use a TA capable of flow control as described in Page 83, Section 3.3.2 (1) (a) also for the communication between the

TA and terminal. Flow control is a function of the TA itself that becomes available by issuing the AT commands to the

modem. See the TA manual for details.

(b) Precautions for selecting a TA

• Set the TA on the Q series C24 side as listed below:

*1 Some TAs may transmit one character as 10 bits. Check the TA specifications when setting the Q series C24

transmission specifications.

*2 Some TAs may switch the communication rate following the start of data communication. Since the Q series C24 cannot

switch the communication rate, set the TA side so that its communication rate does not switch.

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

to high. When using a TA 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.

Item Specifications Remarks

TA-to-TA communication

specification

Connection line ISDN (INS net 64) equivalent, High-speed digital dedicated line DSU and TA are required

Initialization Hayes AT command compatible Page 134, Section 3.4.3

Communication standard B-channel line exchange (V.110), D-channel packet exchange

Electrical condition V.28 compliant

Q series C24-to-TA

communication

specification

Circuit definition V.24 compliant

Q series C24-side

connector (RS-232)

9-pin (female) D sub  User's Manual (Basic)

DR signal control Only the DR (DSR) signal must be able to turn on

Other Compatible with the Q series C24 specification

 Page 82, Section 3.3.1,

 User's Manual (Basic)

Setting item Setting range

Communication rate Depends on the TA in use

TA command Hayes AT command

SI/SO control None

Communication method No procedure

Data format

Data bit

Match the Q series C24

*1*2

Stop bit

Parity bit