3 SPECIFICATIONS
(2)
1)
The following illustration shows the construction of the Q series C24 RS- 422/485 interface driver (send)/receiver (receive).
SDR Driver
Send data
SDB
Output control input (
1) RDA Receiver
Receive data
RDB
1 "Output control input" (also called send gate) of the driver (send) section of the illustration at the left determines whether or not data from SDA/SDB is output to the outside.
2)
When the "Output control input" in the illustration above is ON, the interface enters the low impedance state (state in which data can be sent).
When the "Output control input" is OFF, the interface enters the high impedance state (state in which data cannot be sent).
3)Timing to start sending and to complete the transmission processing for the Q series C24
•Timing to start sending
During data transmission, the Q series C24 outputs the actual data after sending a mark for 2 characters, or longer, after the high impedance set by the operations described in 1) and 2) above is reset.
•Transmission processing completion timing
The following times are necessary as H/W gate OFF time from the time that data transmission is completed until transmission processing is completed (the state changes to the high impedance state). (The transmission rate set in the Q Series C24 is the object.)
When the transmission rate is 600 bps or higher When the transmission rate is 50 bps, 300 bps
(Output control input)
External device
Q series C24
(Output control input)
Data send time range
"Output control input"
ON time range
(Low impedance state)
Q series C24 is in the data
transmission and data reception enable status
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