10
SD-170E Series Operation
Channel select / SCAN
Your radio‟s channel can be selected by inner DIP-S/W or serial command inputted from external control system. To change
channel by inner DIP-S/W (
), you should open the upper cover and then look for the DIP-S/W(
) on the digital board of
the bottom cover. Once located, change the DIP-S/W to select wanted channel according to channel dip switch chart.
To use a serial command for channel selection, it should be inputted by external equipment or device (ex. Personal
computer) through Pin 8 of DB-15 connector. See the message format for serial command for full details.
If your radio has been programmed the channel scan, you must enter the scan mode by serial command.
Transmit
The transmission will be made by various inputs such as PTT signal (Pin 3 of DB-15 connector), TX serial command and
Serial data input (Pin 10 of DB-15 connector: This input is only available when a modem option board is installed). TTL level
is used as PTT signal and is active low. If you installed an option modem board, you can use RS-232 level as a PTT signal
instead of TTL level. To maintain transmission, continuous PTT signal input is required. If you use Tx serial command for
transmission, normally, it‟s released by Rx serial command. If RF activity is present; it will not be illuminated if the radio
indicates a “clear” channel. When the channel is “clear”, input the PTT signal or Tx serial command and transmit data or
audio. Remove the PTT signal or input Rx serial command when you have finished transmission.
CAUTION : Operation of the transmitter without a proper antenna installed may
result in permanent damage to the radio.
Receive
When you have finished transmission, remove the PTT signal or input Rx serial command. You will receive data from
another radio or hear another person talking from the connected external speaker.
