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MELSEC-Q
3 SPECIFICATIONS
4) DTR signal (4)
• When communicating data using the non procedure protocol, the Q series
C24 turns on or off (on when data is receivable) depending on the amount
of unused memory in the OS area allocated for receive data storage, if
DTR/DSR control is being performed.
Read the receive data from the sequence program, as the receive data is
stored in the OS area when the DTR signal is OFF.
If DTR/DSR control is not implements, the DTR signal is always ON.
• If an MC protocol or bidirectional protocol is performing data communication,
the Q series C24 turns ON when communications is enabled.
5) DSR signal (6)
• During DTR/DSR control, if this signal is OFF, the Q series C24 does not
send data to the external device.
Be sure that this signal is always turned ON when the external device is
ready to receive.
• If DTR/DSR control is not implemented, the DSR signal status is ignored.
6) RS signal (7)
• The Q series C24 turns ON/OFF the RS signal as shown below.
• When the communication system is full-duplex communications, if the Q series
C24 ready signal (X1E) is ON, the Q series C24 turns ON the RS signal.
• When the communication system is half-duplex communications, when the
Q series C24 sends data to an external device, it turns ON the RS signal.
• The RS signal is not turned OFF even when the receive data cannot be
stored in the Q series C24.
7) CS signal (8)
• The Q series C24 does not send data to an external device when this signal is OFF.
• Be sure that this signal is always turned ON when the external device is
ready to receive.
8) RI signal (9)
• The RI signal is used when the modem status is monitored on the Q series
C24 side. It should be connected as needed. The RI signal is not needed
to be connected when the modem is not connected.
(2) The ON and OFF states of each signal indicate the following conditions:
(Output side) (Input side)
ON
………
5 V DC to 15 V DC, 3 V DC to 15 V DC
OFF
………
–5 V DC to –15 V DC, –3 V DC to –15 V DC
(3) Interface connector
The Q series C24 uses the following type of RS-232 interface connector.
9-pin D sub (female) screw fixing type
Use one of the following as a connector shell for the connection cable of
the Q series C24 side.
• 3M
Plug model: 8209-6009 Shell model: 3702-2209 M2.6
• Tyco Electronics AMP K.K.
Plug model: 747904-2 Shell model: 747515 or 174469-2