Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 59)

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MELSEC-Q

3 SPECIFICATIONS

(2) RS-422/485 interface operation

1) RS-422-485 interface construction

The following illustration shows the construction of the Q series C24 RS-

422/485 interface driver (send)/receiver (receive).

Receive data

Send data

SDR

SDB

RDA

RDB

Output control input ( 1)

Receiver

Driver

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) RS-422/485 interface operation

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

: Time for 0 to 1 bits of data to be sent

When the transmission rate

is 50 bps, 300 bps : several ms

Outputs a mark for 2 characters, or longer

Data send time range

H/W gate OFF time

(See explanation above)

Q series C24 is in the data

transmission and data

reception enable status

(Output control input)

External device

Q series C24

Data

(Output control input)

"Output control input"

ON time range

(Low impedance state)

"Output control input"

OFF time range

(High impedance state)

Q series C24 is in the data

reception enable state.

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 59

Commentaires sur ces manuels

Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 59

Commentaires sur ces manuels

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