|
Pin
|
Signal
|
Symbols + brief description
|
|
2
|
Transmit DATA (output)
|
TXD (SD) transmits serial data of the computer outward
|
|
3
|
Receive DATA (input)
|
RXD (RD) receives data, which are supplied from the outside
|
|
4
|
Request to transmit (output)
|
RTS (R-S) request to transmit data to the computer.
|
|
5
|
CLEAR to transmit (input)
|
CTS (CS) external device would like to transmit data.
|
|
6
|
DATA set ready (input)
|
DSR (DR) external device is ready for transfer.
|
|
7
|
Signal Ground
|
SG signal mass
|
|
8
|
Carrier Detect (input)
|
CD input for the signal carrier.
|
|
9
|
Calling indicator (input)
|
CI INTERRUPT request of the external device.
|
|
10
|
Logic volume days (output)
|
Vcc supply voltage of the logic (4 to 4,7 V).
|
|
14
|
DATA terminal ready (output)
|
DTR (IT) computer is ready for datentransfer.
|
