Sun Microsystems SPARCstation 20, Руководство по обслуживанию, Страница: 234 / 266

210 SPARCstation 20 Service Manual • July 1996
Serial Ports A and B Connector
TABLE C-4
lists connector pin assignments and signal descriptions for the serial port
A and serial port B connectors.
FIGURE C-4
Serial Ports A and B Connector
TABLE C-4
Serial Ports A and B Connector Pin Assignments
Pin Function I/O Level Signal Description
1 N.C. None GND Not connected
2
Xmit Data A
O RS-232/423 Xmit data A/transmit data
port A
3
Rec Data A
I RS-232/423 Receive data port A
4
RTS A
O RS-232/423 Request to send port A
5
CTS A
I RS-232/423 Clear to send port A
6
DSR A
I RS-232/423 Data set ready port A
7
Ground
GND Signal ground
8
DCD A
I/O RS-232/423 Data carrier detect port A
9 N.C. None GND Not connected
10 N.C. None GND Not connected
11
DTR B
I RS-232/423 Data terminal ready port B
12
DCD B
I RS-232/423 Data carrier detect port B
13
CTS B
I RS-232/423 Clear to send port B
14
Xmit Data B
O RS-232/423 Transmit data port B
13
25
1
14