Operating instructions

1892 1344 - SX450G Transceiver Operator Guide v1.7 / Nov 2007 25
APPENDIX 1: TTL TO RS232 ADAPTOR
These adaptors are used to connect a PC to the SX450G when programming a unit.
Many PCs do not require true RS232, and will work with the simple adaptor of Figure 10.
The transistor used must have a gain of at least 30, and the power supply must be 12V.
Figure 10 - Simple programming adaptor
Figure 11 shows the circuit of an adaptor providing true RS232.
Figure 11 - Programming adaptor (True RS232)