PINOUT DEI CONNETTORI SERIALI RS232, RS-422, RS-574, SGI

[Total: 1    Average: 3/5]

il presente argomento descrive i pinout dei piu’ importanti connettori per la comunicazione seriale a 25 pins e 9 pins

RS-232 Pinouts

RS-232 comes in three flavors (A, B, C) and uses a 25-pin D-Sub connector:

Table 12 – RS-232 Signals
PinDescriptionPinDescription
1Earth Ground14Secondary TXD
2TXD – Transmitted Data15Transmit Clock
3RXD – Received Data16Secondary RXD
4RTS – Request To Send17Receiver Clock
5CTS – Clear To Send18Unassigned
6DSR – Data Set Ready19Secondary RTS
7GND – Logic Ground20DTR – Data Terminal Ready
8DCD – Data Carrier Detect21Signal Quality Detect
9Reserved22Ring Detect
10Reserved23Data Rate Select
11Unassigned24Transmit Clock
12Secondary DCD25Unassigned
13Secondary CTS

RS-422 Pinouts

RS-422 also uses a 25-pin D-Sub connector, but with differential signals:

Table 13 – RS-422 Signals
PinDescriptionPinDescription
1Earth Ground14TXD+
2TXD- – Transmitted Data15Transmit Clock-
3RXD- – Received Data16RXD+
4RTS- – Request To Send17Receiver Clock-
5CTS- – Clear To Send18Unassigned
6DSR – Data Set Ready19RTS+
7GND – Logic Ground20DTR- – Data Terminal Ready
8DCD- – Data Carrier Detect21Signal Quality Detect
9Reserved22Unassigned
10Reserved23DTR+
11Unassigned24Transmit Clock+
12DCD+25Receiver Clock+
13CTS+

RS-574 (IBM PC/AT) Pinouts

The RS-574 interface is used exclusively by PC manufacturers and uses a 9-pin male D-Sub connector:

RS-574 Connector 

Table 14 – RS-574 (IBM PC/AT) Signals
PinDescriptionPinDescription
1DCD – Data Carrier Detect6Data Set Ready
2RXD – Received Data7RTS – Request To Send
3TXD – Transmitted Data8CTS – Clear To Send
4DTR – Data Terminal Ready9Ring Detect
5GND – Logic Ground

SGI Pinouts

Older SGI equipment uses a 9-pin female D-Sub connector. Unlike RS-574, the SGI pinouts nearly match those of RS-232:

Table 15 – SGI 9-Pin DSUB Signals
PinDescriptionPinDescription
1Earth Ground6DSR – Data Set Ready
2TXD – Transmitted Data7GND – Logic Ground
3RXD – Received Data8DCD – Data Carrier Detect
4RTS – Request To Send9DTR – Data Terminal Ready
5CTS – Clear To Send

The SGI Indigo, Indigo2, and Indy workstations use the Apple 8-pin MiniDIN connector for their serial ports:

SGI 8-Pin Connector 

Table 16 – SGI 8-Pin MiniDIN Signals
PinDescriptionPinDescription
1DTR – Data Terminal Ready5RXD – Received Data
2CTS – Clear To Send6RTS – Request To Send
3TXD – Transmitted Data7DCD – Data Carrier Detect
4GND – Logic Ground8GND – Logic Ground