Kenwood TKR-740 Service Manual page 16

TKR-740
1.3. CONTROL I/ O jack
Connector No.
1 NC
2 RXD2 (PC serial data to radio)
3 TXD2 (PC serial data from radio)
4 AUXI 1
5 AUXI 2
6 AUXI 3
7 DG (Digital Ground)
8 TD (TX Data input)
9 TA (TX Audio input)
10 RD (RX Data output)
11 RA (RX Audio output)
12 RXG (RX Ground)
13 SPM (Speaker Mute)
14 NC
15 EXT MON (Monitor SW)
16 EXT PTT (Same as Test SW)
17 SC (Squelch Control)
18 NC
19 TXG (TX Ground)
20 AUXO 1
21 AUXO 2
22 AUXO 3
23 AUXO 4
24 AUXO 5
25 AUXO 6
13 12 11 10 9 8 7 6 5 4 3 2 1
25 24 23 22 21 20 19 18 17 16 15 14
CONTROL I/ O (25pin D-SUB) jack
(View ed from Back Panel)
Notes:
*1Serial data communications with a PC can be done through
either front panel 8-pin modular microphone jack or the rear
panel 25-pin D-SUB interface connector. Firmware can only
be written through the 8-pin modular microphone jack.
M ode
FPU Read/Write
FPU Tuning mode
Firmware programming
Serial Remote
Real time Monitor
16
APPLICATION NOTE
Terminal Name
8pin M odular 25pin D-sub
Yes Yes
Yes Yes
Yes No
No Yes
No Yes
Description
No Connection
PC Read/Write, PC Tuning, Remote
PC Read/Write, PC Tuning, Remote
Programmable Function input 1
Programmable Function input 2
Programmable Function input 3
GND (for Digital ground only)
TX Signalling data input
TX Audio input
RX Signalling data output
RX Audio output
GND (for RA, RD ground only)
Mute input; "Mute: Low"
No Connection
External Monitor input; "Active: Low"*5
External PTT input "ON: 0V OFF: 5V" *3
Squelch status output; "Busy: Low"
No Connection
GND (for TA,TD ground only)
Programmable Function output 1
Programmable Function output 2
Programmable Function output 3
Programmable Function output 4
Programmable Function output 5
Programmable Function output 6
Serial Data transmission method
Full duplex communication
●
Asynchronous system (start-stop asynchronous)
●
Non-parity check
●
Start bit: 1bit, Stop bit: 2bit
●
Data: 8bit, LSB output
●
Baud rate: 9600bps
●
Hardware flow control line not used
●
*2All AUX I terminals (Section 1.3, 1.4), including any AUX I/O
programmed as "AUX Input" with the KGP-47D are Active-
Low logic.
I/ O Level
*1 I RS-232C Level
*1 O RS-232C Level
*2 I 0 or 5V
*2 I 0 or 5V
*2 I 0 or 5V
*3 I 0.5Vpp
*3 I 140mVrms
*3 O 80mVrms
*3 O 400mVrms
I 0 or 5V
I 0 or 5V
I 0 or 5V
O 0 or 5V
*3
*4 O 0 or 5V
*4 O 0 or 5V
*4 O 0 or 5V
*4 O 0 or 5V
*4 O 0 or 5V
*4 O 0 or 5V