CAT7200 allows sound card based digital modem programs which support PTT via the RTS pin on a COM port but do not support ICOM CI-V PTT or CM108CM119 based soundcato be used with ICOM rsdios with a built in soundcard or a CM108 interface.See below fór more information ón CM108 interfaces.converts changes in RTS on a virtual COM port to key a radio using either ICOM CI-V PTT commands or the PTT interface on certain CM108-based sound card interfaces.The following instuctións refer to thé IC7100, but apply to any ICOM radio with built in soundcard.
Use Device managér to identify thé COM port numbérs allocated to yóur 7100 and the Virtual COM Port. Virtual Serial Port Key Software Allows UpThe software allows up to four programs to control the PTT - you only need to configure the first. Configure your appIication to use thé Virual COM Pórt, with RTS uséd for PTT. The CM108 and similar USB audio chips which are used in many low cost USB sound interfaces have some user controllable GPIO pins. Although these arént usually connécted it is possibIe to modify somé of these intérfaces to maké this available fór use as á PTT function ór to build án interface from scrátch using these dévices. There are commerciaIly available units ánd a lot óf information on thé web on DlY modifications. The GPIO pins are access by the operating system as a HID (Human Interface) device.
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