User's Manual

16
User should send Channel Change Command ( 0x64,0x02 , ( 0x64 + 0x2 ) ) to Radio.
If Byte2 and sum of Byte0 and Byte1 among received data are same, Radio sends ACK data to user and
changes to 2
nd
channel. If not, Radio would send Nack data.
Audible alert tones
Your SD-170E series data radio has a sophisticated microprocessor control which provides a range of audible tone. If you
connect the Speaker filtered OUT (Pin 9 of DB-15 connector) to an external speaker, you can hear audible tones at the
following conditions:
• Attempt to transmit on a channel that is already in use when busy channel lockout has been programmed into the radio
• Transmission time has exceeded time-out timer programmed length
• When the other group or people finished transmission using repeater
See the status audible alert tones chart for full details.
STATUS DESCRIPTION AUDIBLE TONE
WARNING
Busy Channel lockout Single Beep Tone ( 800Hz )
Before 5S T-O-T Single Beep Tone ( 800Hz )
Transmit Hang on time Single Beep Tone ( 800Hz )
ERROR PLL Unlock Error Single Beep Tone ( 640Hz )