Adata SP300 Specifications download pdf (Page 15)

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20 mA current loop (option)

Pin no. Signal name

I/O

Function

direction

9 TTY TXDR — Indicates the ground side of the data signal

of 20 mA loop current.

10 TTY TXD OUT Transmitted data of 20 mA current loop.

17 TTY TXDR — Indicates the ground side of the data signal

of 20 mA loop current.

18 TTY RXDR — Indicates the ground side of the data signal

of 20 mA loop current.

19 TTY RXD IN Received data of 20 mA current loop.

23 TTY RXDR — Indicates the ground side of the data signal

at 20 mA loop current.

24 TTY TXD OUT Transmission data of 20 mA current loop.

25 TTY RXD IN Reception data of 20 mA current loop.

RS-422A (option)

Pin no. Signal name

I/O

Function

direction

9 SD (+) OUT Transmitted data

10 SD (–) OUT Transmitted data

17 RD (+) IN Received data

18 RD (–) IN Received data

19 CS (+) IN When the host computer is set to standby

for data transmission, this signal changes to

“SPACE”.

(In this instance, the printer does not check

the signal.)

23 CS (–) IN When the host computer is set to standby

for data transmission, this signal changes to

“SPACE”.

(In this instance, the printer does not check

the signal.)

24 RS (+) OUT Data transmission request signal. When the

printer is ready to receive data, this signal

changes to “SPACE”.

25 RS (–) OUT Data transmission request signal. When the

printer is ready to receive data, this signal

changes to “SPACE”.

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Adata SP300 Specifications Page 15