6 optional charging and communication cradle, Rs-232 computer system, Port – Unitech PT-500 User Manual
Page 11: Rs232 cable, Modem, Telephone line
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RS-232
COMPUTER
SYSTEM
MODEM
TELEPHONE LINE
PORT
MODEM
RS232 cable
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Unitech
Alpha
2.6 Optional Charging and Communication Cradle
The PT015 is an optional charging and communication
cradle (docking station) designed to work with the PT-500.
It provides a connection between the PT-500 and a
computer without sacrificing the convenience of portability
for daily usage. The cradle has been incorporated with a
quick-charge circuit for charging the NiMH battery pack
inside the terminal and the spare battery pack on the cradle
simultaneously. Battery charging with the cradle takes only
three hours - in contrast to the 14 hours required by the DC
power adapter.