Physical/Functional Diagrams 67
6 DSR2 Data set ready
J2 DEC-423 Comm2/Printer Port Connector
Pin 1 HPTRDTR Data terminal ready
2 HPTRTXD Transmitted data
3 GND Transmit ground
4 PTRCOM Receive ground
5 PTRRXD Received data
6 PTRDSR Data set ready
J3 RS-232 Comm1 Port Connector
Pin 1 GND Ground
2 HTXD1 Transmitted data
3 RXD1 Received data
4 HRTS Request to send
5 CTS Clear to send
6 DSR1 Data set ready
7 SIG GND Signal ground
8 HCD Carrier detect
9 Not used
10 Not used
11 Not used
12 SPDIND Speed indicator
13 Not used
14 Not used
15 Not used
16 Not used
17 Not used
18 Not used
19 Not used
20 HDTR1 Data terminal ready
21 Not used
22 Not used
23 HSPDSEL Speed select
24 Not used
25 Not used
J4 Keyboard Port Connector
1 HKBTXD Transmitted data
2 GND Ground
3 +12 V
4 KBRXD Received data
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