On Fri, 25 Jul 2008 00:24:10 +0200, silverdr
wrote:

Hi group(s),

I am looking for the specifications of the CAT protocol mainly for Yaesu
and Kenwood TRXs. I have the basic commands in the user's manual but I
am looking for full specs, including memories management, etc. Any
pointers or hints would be highly appreciated. TNX in advance.

The FT-897D uses 5 byte command blocks.The first 4 bytes hold the
command arguments while the carries the opcode. The manual provides
the opcodes and further details.

Essentially all the control software does is read and write command
blocks to a comm port. In the Windows world the port is controlled via
calls to kernel32.dll.

73 de n4jvp