Appendix C 19
25-pin transceiver connector description
Audio in/out:
• SPK_TRCVR and SPK_TRCVR2 are connected to the transceiver speaker (or line
out) output (main or sub receiver).
• MIC_TRCVR is connected to the transceiver microphone (or line in) input.
• AGND_TRCVR is connected to the transceiver ground (connection point should be
as close to the transceiver as possible).
RigExpert Standard decouples audio in/out signals from computer signals using
transformers, which prevents interference caused by parasitic current in grounding.
FSK output:
FSK_OC is an open-collector output, sinking 50mA maximum (using BC817 NPN
transistor). Connect this pin to FSK_PULLUP to obtain the TTL-level output.
PTT and CW outputs:
PTT_OC and CW_OC are open-collector outputs, sinking 50mA maximum (using
BC817 NPN transistors). PTT5V is a TTL-level PTT output (5V in transmit, 0V in
receive mode), output current is 5mA maximum.
CAT serial in/out:
RigExpert Standard provides various methods of connecting serial in/out lines with
different signal levels to the virtually any model of transceiver. This only requires
shortening some pins on the RigExpert Standard transceiver connector.
• RS-232-compatible mode uses TXD12V and RXD12V lines with ±12V
signal levels, provided by MAX232 interface chip.
• CI-V mode uses CIV_IN and CIV_OUT lines (should be shortened together).
CIV_IN is internally pulled up with 4.7K resistor to 12V_TRCVR, which
should be connected to VCC.
• TTL-level (5V) mode uses TXD5V and RXD5V lines. Signal polarity is
opposite to RS-232 mode.
• Yet another TTL-level mode (signal polarity is the same as with RS-232
mode) uses CIV_OUT output (should be connected to CO_PULLUP) and
CIV_IN input (12V_TRCVR line should be connected to the VCC output). It
is better to use RXD_OE input in this mode (RXD5V should be connected to
VCC to activate this input).
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