User's Manual

1892 1344 - SX450G Transceiver Operator Guide v1.2 / Dec 2006 9
Serial Channel Selection
v PL1 pin 6 must be logic low (<0.8V) to select serial channel selection. This
can be done at any time.
v Channels 0 - 255 are available in this mode
When PL1 pin 6 is first taken low (or it is low at power-up), the unit operates on the
channel most recently selected in serial mode. This setting is remembered during unit
power off.
The channel can be changed by sending a serial channel number as an RS232 character
on PL1 pin 6. The SXWIN.EXE software has the ability to do this, or you can use your
own equipment. The protocol is:
9600 baud, RS232 levels, 1 start bit - 8 bit data - no parity - 1 stop bit
Single-byte, channel number in binary, LSB first (decimal 0 to 255)
As soon as the character is recognised as a valid RS232 character, the channel is
changed. No confirmation is required.