6812CONTROL COMMAND12345678910111213141516 GeneralThe IC-R20 can be connected to a PC via the PC’s RS-232Cport using an optional CT-17 CI-V LEVEL CONVERTOR . Thisallows you to control the receiver from the PC and/or transferdata from the receiver to the PC.Control is provided via Icom’s CI-V Communication Interface. Data formatThe CI-V system can be operated using the following dataformats. Data formats differ according to command numbers.A data area is added for some commands.Controller ➡ IC-R20IC-R20 ➡ Controllerq Preamble code (fixed)w Receiver’s default addresse Controller’s default addressr Command number (see table below)t Sub command number (see table below)y BCD code data for frequency entryu End of message code (fixed) Command tableFE FE 6C E0 Cn Sc Data area FDq w e r t y uFE FE E0 6C Cn Sc Data area FDq e w r t y uDescription Cn ScTransfers frequency data (transceive) 00 —Transfers mode data (transceive) 01 —Reads display frequency 03 —Reads display mode 04 —Sets frequency data 05 —Sets LSB mode0600Sets USB mode 01Sets AM mode 02Sets CW mode 03Sets FM mode 05Sets WFM mode 06Reads squelch condition (open or closed) 15 01Reads S-meter level 02
