Yaesu FTDX101MP Operation Refence Manual page 4

CAT
( Computer Aided Transceiver )
Using the RS-232C Cable
When using an RS-232C cable, the "PS" command (POWER SWITCH) is not available. Therefore, the transceiver
cannot be turned ON with the CAT command.
The FTDX101MP/FTDX101D transceiver has a built-in level converter, allowing direct connection from the rear-
panel RS-232C jack to the serial port of your computer without the need of any external boxes.
The RS-232C jack cannot be used when the external antenna tuner is selected on the menu mode "OPERATION
SETTING" → "GENERAL" → "TUNER SELECT".
• TUNER SELECT
Function: Internal and external antenna tuner settings.
Available Values: INT / EXT1 / EXT2 / EXT3
Default Setting: INT
Description: Select whether to use the "built-in antenna tuner" or the "external antenna tuner". When using
an external antenna tuner, select the antenna connector to be connected.
INT: Use the built-in antenna tuner. External antenna tuner cannot be used.
EXT1: Use an external antenna tuner connected to the ANT 1 connector.
EXT2: Use an external antenna tuner connected to the ANT 2 connector.
EXT3: Use an external antenna tuner connected to the ANT 3/RX connector.
NOTE: The RS-232C jack cannot be used while using the external antenna tuner.
The built-in antenna tuner cannot be used with an antenna connector connected to an external an-
tenna tuner.
You will need a serial cable for connection to the RS-232C (serial or COM port) connector on your computer.
Purchase a standard serial cable (not the so-called "null modem" type), ensuring it has the correct gender and
number of pins (some serial COM port connectors use a 9-pin rather than 25-pin configuration). If your computer
uses a custom connector, you may have to construct the cable. In this case, refer to the technical documentation
supplied with your computer for correct data connection.
① ② ③ ④ ⑤
⑥ ⑦ ⑧ ⑨
Pin No. Pin Name I/O
 N/A ---
‚
SERIAL OUT Output
ƒ
SERIAL IN Input
„
N/A ---

GND ---
†
N/A ---
‡
RTS ---
ˆ
CTS ---
‰
N/A ---
Personal Computer
COM
FTDX101D
Function
---
Outputs the Serial Data from the
transceiver to the computer.
Inputs the Serial Data from the
computer to the transceiver.
---
Signal Ground
---
---
---
---
RS-232C "Straight" Cable
RS-232C
EXT SPKR KEY REM METER EXT ALC RS-232C
ANT 1 ANT 2
A B
LINEAR ACC PTT +13.8V TUNER
GND
3
Operation