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
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