Okay, so transceivers are different than TX / RX pairs. Again Abacom has a programmed PIC (16C58 or so)that will take care of all the tranceiver functions for you: a DPC The Holtek IC's do single direction addressing for RF or IR or whatever. I have developed a PIC program that performs another functions and takes care of transmiiting back and forth between the units. It is fast, reliable and close to my heart. The important parts: 1 don't to talk (transmit) over one another 2 preamble of adequate length 3 manchester coded...1 = 10, 0=01 4 addressing and error checks I can offer some pointers but there are many other people with off the shelf stuff that you may want to buy. Andrew >From: "Tim McDonough" >Reply-To: "Tim McDonough" >To: "Andrew Verhoeven" >Subject: Re: [EE]: Abacom RTL-DATA-SAW Radio Module >Date: Wed, 16 Jan 2002 07:42:25 -0600 > > > I have dealt with John at Abacom often and find him a gentleman. >The TX/RX > > units are probably Radiometrix, but he is getting better units all >the time. > > They work very well with the Holtek IC's, I found it useful to own >the demo > > boards as the are designed to the manufactures spec for antennaes >and ground > > planes. You can often eliminate problems by comparing them to this >standard > > system. It is really important when coding your own data to use a > > manchester code and adequate preamble...all the numbers are on the > > datasheet. > >Andrew, > >What are the Holtek IC's used for? In the system I've inherited the >digital TxD and RxD lines from the transceiver are tied directly to >port pins on the microcontroller (Atmel 8052 derivative.) > >Thanks, > >Tim > > _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu