Unitech PT600 - Manual (Page 11)

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1.2 Interface Ports
The PT600 has a RS232C serial port with miniature RJ10 connector,
Communication by Infrared LED which on the left side of lower cabinet
and charging pads locate on the bottom.
Pin Signal Direction Description
1 DC9 V Input External
power input
2 TXD Output Transmit date
3 RXD Input Receive date
4 N.C.
5 GND Reference Ground
6 N.C.
7 CTS Input Clear to send
8 RTS Output Request to send
9 N.C.
10 N.C.
The diagram below shows the way to connect input/output devices to the
PDT.
RS-232
COMPUTER
SYSTEM
MODEM
TELEPHONE LINE
PORT
MODEM
RS232 cable
10 1