Zenith Data Systems Z-171 PC Series Service Manual page 23

Page 2-6
Installation
Serial connector — This is an RS-232C DTE port used for connecting
serial devices. It can also be used to connect the computer as a terminal
for a larger system.
Table 2-2: Serial Connector Pinout
PIN
NUMBER SIGNAL DESCRIPTION
] GND Ground.
2 SOUT Transmit data.
3 SIN Receive data.
4 RQS Request to send.
5 CLS Clear to send.
6 DSR Data set ready.
7 GND Signal ground.
8 CD Carrier detect.
20 DTR Data terminal ready.
22 RI Ring indicate.
1 13
O Cress) ©)
14 25
Figure 2-4: Serial Connector
DATA FLOW
Out
In
Out
In
In
In
Out
In