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