RS-232 configuration in Digirig 1.9 Lab599’s duplex serial CAT with logic levels Use solder switches on the back of the PCB to disconnect logic level (CMOS) pads and connect RS-232 level signals or request the interface in your order to be pre-configured in order notes. RS-232 is more resilient to RFI, but requires voltage conversion in the serial interface.ĭigirig support RS-232 option starting from revision 1.6. On the larger transceivers the interface is typically an iconic DB-9 connector: RS-232 is used in Elecraft KX series, Kenwood, older desktop Yaesu radios. This is the same interface some of you remember used with computer mice and dialup modems before USB became a thing (man, I’m dating myself). RS-232 is an electrical standard for the serial interface which uses wider voltage range (typically +/-12V) and not compatible with logic levels. To minimize this issue use shorter serial interface cables, use ferrite chokes on the cable, use choke on the coax and most importantly make sure your antenna has the lowest SWR possible so it doesn’t send much RF back into the shack. The interface can sometimes become unresponsive especially during the transmit. Unfortunately there is a price for this simplicity which is the sensitivity for RFI.
The logic levels are the simplest and most cost efficient implementation because those the voltages used by the radio’s digital internals. This is the default Digirig configuration and it is supported by the interface from the very first revision. Paired with the Middleware Software such as FlRig it allows operator to fully control the radio from PC and opens good potential for remote operation. Typically the command set includes all of the radio’s controls including VFO, band selection, preamps, tuner and most importantly transmit command. This interface features distinct TxD and RxD serial port lines which operate at a logical level of 3.3V. We find this option in mid-grade modern rigs like Yaesu’s FT-8xx series and Xiegu. Let’s look at all the rig control options we encounter in modern and classic amateur radio transceivers and the ways to realize their best potential for digital modes and remote operation.
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