Icom IC-R2 Serial Cables
A serial cable provides quick and easy programming of memory channels, memory names and set mode contents via a PC.
NOTE: All interfaces are constructed at your own risk. I will not be held responsible for any damage to scanners and/or computers caused by the use of these interfaces
There are some links to upload/download software here.
MAX233 Serial Cable Schematic
This is a very simple serial interface for the Icom R2 utilising the MAX233 IC. The MAX233 is a simple TTL/CMOS to RS232 level converter in a DIP package. Pin numbers in brackets are for 25 pin RS232.
Note: Ari Xirocostas found that this circuit didn’t work at all for him but he sent me a modified version which did. Ari’s version has a modified power supply to the MAX233 IC, another option would be to do away with the connection to pin 14 and instead connect an external PSU to pin 7 to provide the +5V for the IC. This may well be a better option as some serial ports may not be able to reliably power this circuit.
Icom OPC-478 Serial Cable Schematic
This schematic is for the original Icom OPC-478 cable, for use with the ICOM R2, R3 and the R-10.
Click the diagram for a larger image. Key.
The IN/OUT connection attaches to the RING of a 3 conductor 3.5mm jack plug. The ground connection attaches to the sleeeve of the 3.5mm jack plug.
| R1 | 150 ohms |
| R2 | 33 K ohms |
| R3 | 47 K ohms |
| R4 | 33 K ohms |
| R5 | 15 K ohms |
| R6 | 4.7 K ohms |
| C1 | 1uf 16 v |
| C2 | 0.47 uf 16 v |
| Q1 | 2SA1162 GR |
| Q2 | 2SC3324 GR |
| D1 | 5.1 volt Zener 1/2 watt |
| D2 | MA110 |
| D3 | 1SS133 |
