Newsgroups: rec.radio.amateur.misc From: byon@lynx.cecs.csulb.edu (Byon Garrabrant) Subject: Yaesu FT-5100 CAT/Remote Control Mike Interface Organization: Cal State University, Long Beach Date: Thu, 29 Apr 1993 18:32:33 GMT Lines: 59 I own a FT-5100 and became interested in the Remote Control Mike, not for its wirelessness, but because it can control most of the radio's features via a serial data stream through the mircophone jack. Although I do not own the wireless mike, I was able to build an interface between my PC and my 5100. It is somewhat similar to the CAT interface I have built for my FT-757 HF rig, but mostly like the interface described in the FT-912R manual (loaned to me via a friend from Yaesu). I have recently been working on a micro-controller based radio controller which I use for transmitter hunts, and other ham related activities, and I plan to allow it to control my 5100 soon, but so far I have only controlled the radio from my PC. When using my PC as the source for the serial data, I used a MAX232 chip for a level conversion between the +/- 12 volts levels on the computer and the 0-5 volt levels on the radio. The serial data paramaters are 4800 N82. The commands sent to the radio are simple one byte instructions. The RMC mode ON command (16) must be sent before any other command. When the RMC mode is ON, a small LCD "RMC" icon will light on the display (see owners manual under Display). Also, the Vol, Sql, and Bal knobs are disabled when in the RMC mode because they will be controlled via serial commands, but all other buttons are still active. The commands are as follows: 0 - RPT 12 - CALL 24 - SQL Up 2 - REV 14 - BAND 26 - VOL Up 4 - MHZ 16 - RMC 28 - BAL Right 6 - D/MR 18 - SUB 30 - BAL Left 8 - TONE 20 - PAGE 32 - SQL Down 10 - LOW 22 - F/W 33 - VOL Down The interface I built simply wired mike port pin 7 to serial ground and pins 1 and 3 each through a diode then together, to the serial source. Note: I am not a hardware person! Use this hardware at your own risk. +----1 7-------------- GND | 2 8 6 (These can be connected to a MAX232 | +--3 5 +-+-------- SER IN or the FIF-232C pins 1 and 3) | | 4 | | | +--->|---+ | +----->|-----+ You can wire 1 and 3 together first, then through 1 diode, but that disables the UP and DOWN buttons. I will continue to study this more. If anyone would like to know more, or has any corrections or feedback, please email me. 73 Byon --------------------------------------------------------------------- Byon Garrabrant KD6BCH byon@csulb.edu --------------------------------------------------------------------- -- Byon Garrabrant KD6BCH byon@csulb.edu