Subject: BUILD OWN KENWOOD COMPUTER INTERFACE COMPLIMENTS OF WA2SNA BBS IN NYC,USA -------------------------------------------------------------------------------- Mark C. DiVecchio 10435 Mountain Glen Terrace, San Diego, CA 92131 K3FWT Home of PC-VT and LPTx 619-549-4056 sdcsvax!man!wolf!markd Bulletin Board 619-549-3927 -------------------------------------------------------------------------------- Kenwood Computer Interface Instructions _______________________________________ These Instructions are TS-440 specific, but the basics also apply to the TS-940, TS-811 and TS-711. It is possible to save yourself a few dollars and lose nothing in quality by buying the parts to upgrade your Kenwood radio for computer control. Just purchase the parts were you find them and install them using the instructions in the Radio's Manual. IC 54 is a uPD-8251-AC Serial Communications Interface. Commonly called an 8251A ($1.89 Mail Order) IC 55 is a TC-4040-BP 12 Stage CMOS Divider. Commonly called a 4040 ($0.69 Mail Order) The IC-10 Interface Kit from Kenwood Contains ONLY these two parts and less instructions than are in this file. The only thing you are going to miss, is the $22+ price tag on the IC-10 Kit. Signals are TTL levels (NOT RS-232) Baud rate is 4800 (1200 Opt.) Format is ASCII Serial; 1 Start, 8 Data, 2 Stops The Baud rate may be changed to 1200 Baud by removing jumper W50 and installing a jumper from the left pad to the center pad as viewed from the front of the radio. This will become obvious once you have the radio opened up. Many other Baud rates are possible, just look at the schematic. As long as you are in the radio, lift D-60 to enable the 10 Hz. display. The main tuning knob is varing this digit, so you might as well see it. It also helps when using RIT/XIT as the RIT/XIT display does not resolve the 0.01 KHz. digit. This Modification is in the Radio's Book. Not in the book is the fact that if you lift D-80 and do an MPU reset, you will be able to transmit on any frequency between 1.5 and 30.0 MHz. This means you will be able to work the Mars nets, Etc. Do not transmit out of band. It is illegal even if it is accidental. Some computers use TTL levels on their serial ports. If so, here is a time when you will not have to convert it to RS-232. The IF-232 Interface from Kenwood is a 1488 and a 1489 chip in a box. These are an RS-232 Quad Line Driver and Receiver and are available at Radio Shack for $1.29 Each. Here is an easy project that will save you a lot over the $69+ Kenwood price of the IF-232 Interface. The 1488 needs a + and - supply. Unregulated + and - 12vdc is just fine. Get the +5 vdc for the 1489 by putting a 7805 regulator on the +12 vdc supply. 100 ma. is about the max you'll draw, so the smallest transformer you can find will still be plenty large. Don't forget to series up two of each gate to cancel the inversion that the 1480's produce. ACC-1 Connector Use a 6 Pin DIN Connector. (Radio Shack $1.29) Pin Signal Comments ________________________ 1 Gnd Signal Ground 2 TXD Serial Data from Radio to Computer 3 RXD Serial Data from Computer to Radio 4 CTS Computer Ready; (Radio Input) 5 RTS Radio Ready; (Radio Output) 6 No Connection Pins 4 and 5 may be left Unconnected. ***** Command Description for Kenwood Computer Interface ***** ______________________________________________________________ Auto Information ________________ AIn; The Radio Will Send the Status Info Automatically Whenever the Operator Manually Varies any Function on the Radio which is Covered in the IF; Command Where n = 0 for Auto Info OFF 1 for Auto Info On The Status Information Will be Sent in the Form : As defined in the IF; Command Display Memory ______________ DMnnnn; This is a Factory Diagnostic Function and is of no practical use to the operator The Contents of the MPU Memory will be Read Where nnnn = MPU Address (0000 Thru FFFF (HEX)) The Contents of the MPU Memory Will be Sent in the Form : DMnnnn-aabbccddeeffgghhiijjkk; Where nnnn = MPU Address (0000 Thru FFFF (HEX)) aa~~kk = Hex Number Pairs Of Next 16 Locations Down ____ DN; The Frequency or Memory Channel Will Decrement One Step Frequency VFO A / VFO B Request _______________________________ FA; FB; The Frequency in the Selected VFO Will be Read The Frequency Will be Sent in the Form: FAggmmmkkkhhh; or FBggmmmkkkhhh; Where gg = GHz. Value mmm = MHz. Value kkk = kHz. Value hhh = Hz. Value