microHAM microKEYER Manual page 21

Beginning with version 7.0, Router provides unique control capability: the 2
fork (software 'Y' connector) that allows a second application to share control of the radio. Router monitors
when data is sent from each application and routes the radio's responses to the correct virtual port.
IMPORTANT: Both applications must use same communication parameters (baud rate, data length, parity
and number of stopbits) for proper operation!
Neither CAT port has priority. Polls/commands from each application are processed alternately. In order
to avoid collisions and avoid confusion due to unexpected data, responses from the radio are returned only
to the application that generated the command. Unsolicited data from the radio such as automatic
frequency/mode updates (Icom "transceive" packets or "Auto-information" data from Kenwood, Elecraft
and recent Yaesu transceivers) are forwarded to both CAT ports.
Due to physical limitation of data channel throughput on radio and the controller capabilities in various
transceivers, there are several important rules which must be observed.
Total data throughput from both loggers must not exceed maximum throughput of the radio control
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port and transceiver controller. In other words, the polling rate from one application may need to be
decreased to provide data space for the second application and vice versa.
Applications must be tolerant of delayed responses from the radio. Each logger must wait patiently
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for radio response while another logger communicates with the radio.
Due to protocol deficiencies in handling VFO split commands with many transceivers (particularly
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Icom), split mode must be initiated and ended by only one application and manual split control (from
the front panel of the radio) should not be used.
NOTE: Despite extensive testing using various combinations of applications for the CAT and 2
CAT ports, microHAM cannot guarantee proper operation with every potential combination of
applications.
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2 CAT PORT
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CAT Port is an intelligent data
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