User`s manual

206
7.2 Control Contents of DC Code Control
This control uses the Q series C24 transmission control data to inform the external device whether or not local station
is ready to receive data and the valid range of the send and receive data.
The four kinds of Q series C24 DC code control shown below are available. These control functions can be used
simultaneously.
(1) DC1/DC3 transmission control, DC1/DC3 reception control
The Q series C24 informs the external device whether or not local station is ready to receive data by transmitting
the DC1 and DC3 signals and checks whether or not the external device is ready to receive data by receiving the
DC1 and DC3 signals.
DC1: Control data that informs the external device that the Q series C24 is ready to receive data
DC3: Control data that informs the external device that the Q series C24 is not ready to receive data
D
C
3
D
C
1
D
C
3
D
C
1
External device
Programmable
controller CPU
Data 1-1
Data 1-2
Data 2-1 Data 2-2
(Terminate)
(Restart)...Continue
(Terminate)
(Restart)...Continue