25-Pin Connector (D-Sub) - Kenwood TKR-751 Modification Information

1.3

25-pin Connector (D-SUB)

The 25-pin connector is located on the rear panel of the
TKR-750/850/751/851 and you can connect external
devices, such as a trunking controller.
No. Pin name
1 NC
2 RXD2
3 TXD2
4 AUXI 1
5 AUXI 2
6 AUXI 3
7 DG
8 TD
9 TA
10 RD
11 RA
12 RXG
13 SPM
14 NC
15 EMON
16 EPTT
17 SC
18 NC
19 TXG
20 AUXIO 1
21 AUXIO 2
22 AUXIO 3
23 AUXIO 4
24 AUXIO 5
25 AUXIO 6
Note: Refer to the "Function Reference" for functions that you can
assign to the Auxiliary Input/Output terminal.
Version: 1.02 USA
Input/Output
--- No connection (RSSI output after modification; 0.2 to 2.5V)
PC serial data input (COM 2); TTL/RS-232C level
Input
H=more than +2.4V/ L=less than +0.4V/ 5ohm Road/ for FPU read, PC Tuning
PC serial data output (COM 2); TTL/RS-232C level
Output
H=more than +5V/ L=less than -5.0V/ for FPU write, PC Tuning
Input H=more than 4.0V/ L= less than 1.0V/ 5V pull-up
Input H=more than 4.0V/ L= less than 1.0V/ 5V pull-up
Input H=more than 4.0V/ L= less than 1.0V/ 5V pull-up
--- Control line Ground (TXD/RXD/AUX, etc.)
Transmission Data input; Deviation=15% STD@0.5Vpp 100Hz (Adjustable)
Input
600ohm Road, 50uF AC coupled, Non Pre-emphasis (+1/-3dB@0-10kHz)
Transmitted Audio signal input; Deviation=60% STD@280mVrms 1kHz (Adjustable)
600ohm Road, 1uF AC coupled
Input
300-3kHz +6dB/Oct. (EIA curve)@TA line pre emphasis off=Enable
300-3kHz +/-3dB@TA line pre emphasis off=Disable
Received Data output; 80mVrms@1kHz STD/ 1kohm Road/ 10uF AC coupled/
Output
Response +/-2.5dB@0 - 5kHz/ Non-squelched
Received audio signal output; 400mVrms@1kHz STD/ 1kohm Road/ 1uF AC coupled/
Output
Response -6dB/oct@300-3kHz/ Squelched
--- Ground for RA/RD
Input Speaker Mute input; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ Active L
--- No connection
Input External Monitor Switch input; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ Active L
Input External PTT Switch input; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ Active L
Output Squelch Control output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ L=Busy
--- No connection
--- Ground for TA/TD
Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max
Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max
Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max
Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max
Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max
Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max
Modification Information (MOD)
1 TERMINAL FUNCTION
Figure 1-4 25-pin connector (D-SUB)
Table 1-3 Assigning signals to 25-pin connector
Description
3