Maxon SD-274, Руководство пользователя

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7
⑧
PROG
(DATA IN)
Programming data input, 5V TTL
⑨
SPK/POCSAG
SPK: Audio output from the audio
amplifier, @ 8Ω.
POCSAG: To transmit POCSAG code.
Jumper selectable.
AUDIO_IN is effective only
when PIN7 (MIC) is vacant or
with +5V high level. 3KHz
LPF filter existed in audio
channel.
⑩
RXD
(MODEM)
The serial data is input to modem
through this pin. Default is RS232.
The hardware is one of
RS232, RS485 or TTL/5V
when delivery.
⑪
TXD
(MODEM)
Serial data is output from modem via
this pin. Default is RS232.
The hardware is one of
RS232, RS485 or TTL/5V
when delivery.
⑫
CD_OUT
(MODEM)
Logical level output to indicated
whether a carrier or not. Low lever for
carrier, high level for no carrier.
⑬
NC No connection
⑭
GND Ground
⑮
NC No connection
Antenna installation
Fasten the antenna to the radio by turning the antenna connector clockwise into the
receptacle on right of radio when looking at front of radio.
Powering the Data Radio
SD-270 accepts variable sources of DC power to permit more versatile use. This radio
operates from 9.6V to 16V DC and standard voltage for testing is 12V DC. The 4
th
pin
of DB15 female connector is the power input pin.
SD-270 Series Function
Channel Spacing
The radio is capable of programmable channel spacing, having 12.5KHz or 25KHz
channel spacing.