Elecraft KRC2 Manual - Manual (Page 21)

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Jumpers W4 and W5 determine the bandmap used for outputting band data. For normal use they
should be removed. The KRC2 Configuration tool allows the bandmaps to be edited by the user.
Jumpers W4 and W5 may be used in conjunction with the Configuration tool remapping in order
to allow alternate or extended output configurations. See the KRC2 Configuration Tool
documentation for more information.
Jumpers W9-W23 are used to connect or disconnect the DB-9 connectors from the KRC2.
Normally these jumpers should be left installed. When used with a K2, the minimum jumpers that
must be installed in this block are W16, 18, 19, 21 and 23. DO NOT install jumper W20 when
using the KRC2 with the K2. Doing so will cause problems in the K2, including disabling SSB
output. If the PC connector (J1) is used to pass K2 information through to a peripheral such as a
KAT100, it is important that all jumpers in the W9-W23 block with the exception of W20, be
installed.
Jmpr Connector Discussion
W9 J1 Pin 2 - PC Enables Serial Data to PC from KRC2 or XCVR.
W10 J1 Pin 3 - PC Enables Serial Data from PC to KRC2 or through to XCVR.
W11 J1 Pin 4 - PC Enables J1 Pin 4
W12 J1 Pin 9 - PC Enables J1 Pin 9
W13 J1 Pin 8 - PC Enables J1 Pin 8
W14 J1 Pin 7 - PC Enables J1 Pin 7
W15 J1 Pin 6 - PC Enables J1 Pin 6
W16 J2 Pin 6 - XCVR Enables K2 AuxBus signal into KRC2. Must be installed for
KRC2 AuxBus band decode mode operation.
W17 J2 Pin 7 - XCVR Enables K2 VRDET signal into KRC2.
W18 J2 Pin 8 - XCVR Enables K2 12CTRL signal into KRC2. This signal normally
powers the KRC2.
W19 J2 Pin 9 - XCVR Enables K2 8R signal into KRC2. Used to determine
transmit/receive activity in K2 operating mode.
W20 J2 Pin 4 - XCVR Enables K2 ALC signal into KRC2.
DO NOT insert this jumper when using the KRC2 with the K2!
W21 J2 Pin 3 - XCVR Enables K2 TxD signal from KRC2 serial port driver.
W22 J2 Pin 3 - XCVR Enables K2 TxD signal from J1 pin 3 (PC serial port driver).
W23 J2 Pin 2 - XCVR Enables K2 RxD serial port signal into KRC2.
Table 4