Understanding Interlocks - microHAM MK2R Manual

MK2R provides several forms of interlock and timing protection. When a radio is locked, MK2R immediately
disables any input to the "locked" radio which could cause it to generate RF (microphone, sound card
output, CW, PTT1, PTT2, and PAPTT). The inputs remain disabled as long as the condition that generated
the lock continues.
There are five locks:
Transmit interlock (or "SO2R mode")
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Same Band lockout
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Transmit Inhibit
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External Inhibit (Inhibit In)
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Transceiver Enable (Inhibit Out)
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Except for the "same band" and "SO2R" locks, the interlocks operate independently for each radio.
Transmit interlock: is enabled by selecting the SO2R mode check box on the SO2R tab. Transmit
interlock can be "first one wins" or "last one wins." If selected, simultaneous transmission on both
radios is not allowed. When not checked, the radios can transmit at the same time. This lock works
independently of any logging software.
Same Band Lockout: disables both radios (or one radio and any other radio present on the iLink bus) if
MK2R detects two radios on the same band. When the same band lockout is activated transmission
on all radios on the effected band are immediately disabled and the BUSY LED will start flashing.
Transmission will be enabled when only one radio remains on the effected band.
There are three methods of band decoding:
the frequency of each radio is obtained from Router based on the frequencies obtained by
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decoding the transceiver control communication.
band is obtained from the transceiver BAND DATA (BCD) output. This is the preferred
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method because it is the fastest and most secure way to obtain the band data. Unfortunately
this data is available only from certain Yaesu transceivers and the Elecraft K3. However, if
you are interfacing MK2R with FT-450, FT-840, FT-900, FT-920, FT-950, FT-990, FT-1000D,
FT-1000MP, Mark V, FT-2000 or FT-9000, you should connect the Band Data output to the
ACC port and select pins 6-13 as band data inputs.
If band data is provided by the transceiver, SAME BAND protection works even if the computer is
turned off or you are using an MS-DOS based logging program.
NOTE: If the ACC port is configured for band data input, that input has priority and is assumed to be valid
even when communications (CAT) is lost or an error causes Router to decode a different frequency.
Do not configure the ACC pins as band data inputs unless they are connected to a radio. If they are left
unconnected, a "same band" lockout will occur.
In stand alone mode (MK2R is not connected to the Router) frequency is obtained directly
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from the transceiver connected to MK2R and distributed via the iLINK bus.
NOTE: If one radio is turned off, cycle the power on MK2R to disable "same band" lockout.
BUSY: is a lockout designed for Serial Devices defined on the ACC tab. When the serial device responds
to the MK2R with a "busy" response, MK2R locks out the specified radio. While the serial device is BUSY
the BUSY light on MK2R front panel will be lit.
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Understanding Interlocks

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