User`s manual

82
3.3 Specifications
This section explains the transmission specification on the Q series C24 side, connectable modems/TA's (terminal
adapter), I/O signals related to the modem function, and buffer memory for the usage of the modem function.
3.3.1 Transmission specifications
The transmission specifications on the Q series C24 side for use of the modem function are as listed below.
The transmission specifications between Q series C24 and a modem/TA (local station Q series C24) that are not
provided in this table are listed in the User's Manual (Basic).
*1 When the first five digits of the serial No. are 03042 or earlier, the transmission speed cannot be set to 115200 bps for
connection between the Q series C24 and GX Developer via a modem.
Item
QJ71C24N
QJ71C24
LJ71C24
QJ71C24N-R2
QJ71C24-R2
LJ71C24-R2
QJ71C24N-R4
Modem function Available Not available
Interface that can use the modem function RS-232

Linked operation between CH1 and CH2 of the Q series C24 Not available
Communication method Full-duplex communications
Synchronization method Asynchronous method
Transmission speed
*1
1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400,
57600, 115200 (bps)
Data format
Start bit 1
Data bit 7 / 8
Parity bit 1 (On) / 0 (Off)
Stop bit 1 / 2
Error detection
Parity check On (odd/even selectable) / Off
Sum check code On / Off
Transmission control RS/CS control yes/no (selectable)
Data communication
Nonprocedural protocol Available
Bidirectional protocol Available
MC protocol Available
Pre-defined protocol Not available
Line connection (Q series C24: modem) 1:1