Mitsubishi MELSEC L Series User Manual page 80

Item
Connection line
TA-to-TA
Initialization
communication
specification
Communication standard
Electrical condition
Circuit definition
Q series C24-side connector
Q series C24-to-
(RS-232)
TA
communication
DR signal control
specification
Other
3 - 15
(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 (1) (a) in this section
also for the communication between the TA and terminal.
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
1) Set the TA on the Q series C24 side as listed below:
Data format
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.
2) 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.
3 COMMUNICATIONS BY THE MODEM FUNCTION
Specification
ISDN (INS net 64) equivalent
High-speed digital dedicated line
Hayes AT command compatible
B-channel line exchange (V.110)
D-channel packet exchange
V.28 compliant
V.24 compliant
9-pin (female) D sub
Only the DR (DSR) signal must be able to turn on
Compatible with the Q series C24 specification
Setting item
Communication rate
TA command
SI/SO control
Communication method
Data bit
Stop bit
Parity bit
Remarks
DSU and TA are required
See Section 3.4.3
—
User's Manual (Basic)
1
( )
See Section 3.3.1, User's
Manual (Basic)
Setting range
Depends on the TA in use
Hayes AT command
None
No procedure
Match the Q series C24 (
1 2
) ( )
3 - 15