Robert Lunn wrote: > > >I need to measure a continuous frequency between 0 - 250 cycles/MINUTE, > >and transmit it via RS-232 at 2400 baud in a message containing 6 bytes > >once 5 seconds. > > Peter, what's the six-byte message you send? > > (I want to get a handle on the processing required to > create the message string.) Bob, Sorry, but there are only five bytes and are as follows; Byte Description ----------------------------------------------------------------- 1 Start of Message ID Constant 2-3 Unit Identification 15 bits constant (1 bit battery low) 4 Frequency Value Variable 5 Checksum Variable Sorry for the delay in answering, and thanks for your interest. Regards, Peter -- _______________________________________________________________________ Peter Homann email: peterh@adacel.com.au Work : +61 3 9596-2991 Adacel Pty Ltd Fax : +61 3 9596-2960 250 Bay St, Brighton 3186, VIC, AUSTRALIA Mobile : 014 025-925