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

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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
Pin Description Pin Description
1 Earth Ground 14 Secondary TXD
2 TXD – Transmitted Data 15 Transmit Clock
3 RXD – Received Data 16 Secondary RXD
4 RTS – Request To Send 17 Receiver Clock
5 CTS – Clear To Send 18 Unassigned
6 DSR – Data Set Ready 19 Secondary RTS
7 GND – Logic Ground 20 DTR – Data Terminal Ready
8 DCD – Data Carrier Detect 21 Signal Quality Detect
9 Reserved 22 Ring Detect
10 Reserved 23 Data Rate Select
11 Unassigned 24 Transmit Clock
12 Secondary DCD 25 Unassigned
13 Secondary CTS

RS-422 Pinouts

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

Table 13 – RS-422 Signals
Pin Description Pin Description
1 Earth Ground 14 TXD+
2 TXD- – Transmitted Data 15 Transmit Clock-
3 RXD- – Received Data 16 RXD+
4 RTS- – Request To Send 17 Receiver Clock-
5 CTS- – Clear To Send 18 Unassigned
6 DSR – Data Set Ready 19 RTS+
7 GND – Logic Ground 20 DTR- – Data Terminal Ready
8 DCD- – Data Carrier Detect 21 Signal Quality Detect
9 Reserved 22 Unassigned
10 Reserved 23 DTR+
11 Unassigned 24 Transmit Clock+
12 DCD+ 25 Receiver Clock+
13 CTS+

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
Pin Description Pin Description
1 DCD – Data Carrier Detect 6 Data Set Ready
2 RXD – Received Data 7 RTS – Request To Send
3 TXD – Transmitted Data 8 CTS – Clear To Send
4 DTR – Data Terminal Ready 9 Ring Detect
5 GND – 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
Pin Description Pin Description
1 Earth Ground 6 DSR – Data Set Ready
2 TXD – Transmitted Data 7 GND – Logic Ground
3 RXD – Received Data 8 DCD – Data Carrier Detect
4 RTS – Request To Send 9 DTR – Data Terminal Ready
5 CTS – 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
Pin Description Pin Description
1 DTR – Data Terminal Ready 5 RXD – Received Data
2 CTS – Clear To Send 6 RTS – Request To Send
3 TXD – Transmitted Data 7 DCD – Data Carrier Detect
4 GND – Logic Ground 8 GND – Logic Ground