<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:'bookman old style', 'new york', times, serif;font-size:10pt"><div style="font-size: 10pt; ">Bob,</div><div style="font-size: 10pt; "><br></div><div style="font-size: 10pt; ">all you have to do, is to put together RXD & TXD pins from CP 2101 output module and you have <span class="Apple-style-span" style="font-size: 16px; ">CI/V for your Icom</span></div><div style="font-size: 10pt; "><span class="Apple-style-span" style="font-size: 16px; "> (</span><span class="Apple-style-span" style="font-size: 16px; ">rxd+txd and ground of course)</span></div><div style="font-size: 10pt; "><span class="Apple-style-span" style="font-size: 16px; ">the same think i made it for my IC7000 and work nice at 4800 bauds</span></div><div style="font-family: 'bookman old style', 'new york', times, serif; font-size: 10pt; "> without max, without cell ,
etc...</div><div style="font-family: 'bookman old style', 'new york', times, serif; font-size: 10pt; "><br></div><div style="font-family: 'bookman old style', 'new york', times, serif; font-size: 10pt; "> good luck and 73!</div><div style="font-family: 'bookman old style', 'new york', times, serif; font-size: 10pt; "><br></div><div style="font-family: 'bookman old style', 'new york', times, serif; font-size: 10pt; ">aslexander - yo2ldk</div><div style="font-family: 'bookman old style', 'new york', times, serif; font-size: 10pt; "><br><div style="font-family:bookman old style, new york, times, serif;font-size:12pt"><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Bob <k8ys@fuse.net><br><b><span style="font-weight: bold;">To:</span></b> TAPR APRS Mailing List <aprssig@tapr.org><br><b><span style="font-weight: bold;">Sent:</span></b> Fri, June 3, 2011 1:19:46 PM<br><b><span style="font-weight:
bold;">Subject:</span></b> Re: [aprssig] has anyone built/modified a USB to TTL level converter??<br></font><br>well, yeah,<br><br>I have an IC706 that it TTL.<br>I have a MAX233 IC (TTL to RS232 level converter/interface/transceiver)<br>I have a Sil Labs CP2101 already mounted on a small board with a USB cable,<br>and I have the drivers for the CP2101. This used to be a "goezinta box" for<br>a cell phone. <br><br>My goal was to build, kluge together an CI/V that went from USB to TTL by<br>raiding my junque box.<br><br>I have TTL to RS232 level converters that I have built in the past, but I<br>have never played with USB and since all of my computers these days are USB<br>and none with a real (semi real) RS232 interface, I brought my question to<br>this group.<br><br> Bob<br><br>-----Original Message-----<br>From: <a ymailto="mailto:aprssig-bounces@tapr.org" href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a> [mailto:<a
ymailto="mailto:aprssig-bounces@tapr.org" href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a>] On Behalf<br>Of Greg D<br>Sent: Friday, June 03, 2011 2:44 AM<br>To: TAPR APRS Mailing List<br>Subject: Re: [aprssig] has anyone built/modified a USB to TTL level<br>converter??<br><br>Hi Bob,<br><br>Uh, let me see if I have this right...<br><br>You are trying to drive your IC706 rig from a computer. The computer has <br>a regular (RS-232) serial port (or you can make one with a standard <br>dongle), and the radio needs TTL. You want to connect the two, right?<br><br>A TTL "high" signal (+3v or so) translates to a negative half dozen <br>volts or so on RS-232, and a TTL "low" (0v) maps to a positive half <br>dozen volts or so on RS-232. You don't need to make this any more <br>complicated than it is.<br><br>If you're halfway handy with a soldering iron, to drive the rig from the <br>computer, all you need is a transistor, diode, and a resistor
or two. <br>Let me know if you are interested and I can dig up the schematic. I <br>drive my Yaesu FT-736R like this, and it works great.<br><br>To drive the computer from the rig, it's something equally simple. The <br>Yaesu rig doesn't talk back to the computer (really annoying!), but I <br>think the diagram I'm remembering has both directions covered. If you <br>can find the schematic for the original FODTrack satellite tracking <br>controller, I believe it's in there.<br><br>Greg KO6TH<br><br><br>Bob wrote:<br>> I need TTL.<br>> I have RS232<br>> I have USB<br>> I do not have a RS232 port. Rules out the standard USB to RS232 dongle.<br>><br>> I think that I want to take an old cell phone to computer interface that<br>has<br>> a USB to RS232 level converter. It is a common chip, and I have the<br>drivers.<br>><br>> I want to take the RS232 from the cell phone cable and feed it to a MAX233<br>> to get TTL
in/out.<br>><br>> Then use the TTL to talk to the IC706m2g to control the radio.<br>><br>> Without reinventing the wheel, is there a "better way"?<br>><br>> Bob K8YS<br>><br>><br>> _______________________________________________<br>> aprssig mailing list<br>> <a ymailto="mailto:aprssig@tapr.org" href="mailto:aprssig@tapr.org">aprssig@tapr.org</a><br>> <a href="https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig" target="_blank">https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig</a><br>> <br><br>_______________________________________________<br>aprssig mailing list<br><a ymailto="mailto:aprssig@tapr.org" href="mailto:aprssig@tapr.org">aprssig@tapr.org</a><br><a href="https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig" target="_blank">https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig</a><br><br>-----<br>No virus found in this message.<br><span>Checked by AVG - <a target="_blank"
href="http://www.avg.com">www.avg.com</a></span><br>Version: 10.0.1375 / Virus Database: 1511/3675 - Release Date: 06/02/11<br><br><br>_______________________________________________<br>aprssig mailing list<br><a ymailto="mailto:aprssig@tapr.org" href="mailto:aprssig@tapr.org">aprssig@tapr.org</a><br><a href="https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig" target="_blank">https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig</a><br></div></div><div style="font-size: 10pt; position: fixed; "></div>
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