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SB-2000 MK2 USB RADIO INTERFACE
CG Antenna Co., Ltd.
The right diagram shows the definition of the DB-25 plug.
RS TX/RX
TX/RX function (from computer) in RS-232 protocol. Yaesu or Kenwood
uses it for those CAT rig control in RS-232 protocol.
TX/RX
TX/RX function (from computer) in TTL protocol. Both CI/V and CAT
use this way.
RTS/DTR
Output control. For most ham radio software setting, RTS is used for PTT
and DTR is used for CW/FSK.
AF IN/OUT (Computer sound card based)
AF IN is the audio from transceiver. AF OUT is the audio to transceiver.
UPDATE: 8 DEC 2016
http://www.cgantenna.com
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