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Back to Home 		Kenwood NXR-1700 / 1800 Repeater DB-25 Accessory Connector Pinout
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This is the pinout of the female DB-25-pin CONTROL I/O CONNECTOR on the back of the Kenwood NXR-1700 / 1800 repeaters.

Pin
No.		 Pin
Name		 Input /
Output		 Signal Type Modifi-
cation		 Function Rating and Condition Note
Parameter Min Typ Max Unit
1 NC – No
RSSI O Analog Yes RSSI DC Voltage Range 0.0 3.3 V RSSI=Received Signal Strength Indicator
RESET I Digital Yes Reset VIH 5 +B V
VIL 0.5 V
High Pulse Width 100 ms
2 RXD2 I Digital No Asynchronous
Receive Data		 Voltage Range -30 +30 V Conform to RS-232C
Baud Rate 230 kbps
3 TXD2 O Digital No Asynchronous
Send Data		 RL=3k ±5.0 ±9.0 V
Baud Rate 230 kbps
4 AI2 I Digital No Programmable
Function Input 1		 VIH 0.7*V
CC		 VCC V 47k Pull Up to VCC
5 volts ±3%
VIL VSS 0.8 V
CTS I Digital Yes Clear to Send Voltage Range -30 +30 V Conform to RS-232C
5 AI2 I Digital No Programmable
Function Input 2		 VIH 0.7*V
CC		 VCC V 47k Pull Up to VCC
5 volts ±3%
VIL VSS 0.8 V
RTS O Digital Yes Request to Send Voltage Swing   RL=3k ±5.0 ±9.0 V Conform to RS-232C
6 AI3 I Digital No Programmable
Function Input 3		 VIH 0.7*V
CC		 VCC V 47k PU to VCC
5 volts ±3%
VIL VSS 0.8 V
7 DG – GND Digital Ground – – – – –
8 TD I Analog No TX Data Input
(Signaling)		 0.1kHz / 0.5 Volts p-p 0.70 0.75 0.80 See note NFW or WFM
Input Impedance 600 Ohms 600 PD to GND
9 TA I Analog No TX Audio Input
(Voice)		 1 kHz / 60%Dev. 270 280 290 mVrms NFW or WFM
Input Impedance 600 Ohms 600 PD to GND
Input Level 2.0 RMS Volts
10 RD O Analog No RX Data Output
(Signaling)
Not Squelched		 Output Voltage
/60%Dev.		 75 80 85 mVrms Allowable Load 47k ohms
11 RA O Analog No RX Audio Output (Voice)
Squelched and
De-Emphasized		 Output Voltage
/60% Dev.		 380 400 420 mVrms Allowable Load 47k ohms
12 RXG – GND No RX Signal Ground – – – – –
13 NC – – No – – – – – –
14 AO1 O Digital No Auxiliary Output 1
Open Collector		 External Voltage 16 V
Allowable Current 200 mA
Yes Auxiliary Output 1
Open Collector
With Pull Up		 Pull Up Resistor 4.7k 47k VCC 5 volts ±3%
VOL(IO=0mA) 0.1 Volts
15 EMON I Digital No External Monitor Switch VIH 0.7*V
CC		 VCC V 47k PU to VCC
5 volts ±3%
VIL VSS 0.8 V
16 EPTT I Digital No External Push To Talk VIH 0.7 V
CC		 VCC V 47k PU to VCC
5 volts ±3%
VIL VSS 0.8 V
17 SC O Digital No Squelch Control VOH VCC V Open Drain
47k PU to VCC
5 volts ±3%
VOL 0.4 V
18 AO2 O Digital No Auxiliary Output 2 External Voltage 16 V
Allowable Current 200 mA
Yes Auxiliary Output 2
Open Collector
With PullUp		 PullUp Resistor 4.7k 47k VCC 5 volts ±3%
VOL(IO=0mA) 0.1 Volts
19 TXG – GND No TX Signal Ground – – – – –
20 IO1 I Digital No Programmable
Function I/O 1		 VIH 0.7*V
CC		 VCC Volts 47k Pull Up to VCC
5 volts ±3%
VIL VSS 0.8 Volts
Input Impedance 47k
O VOH(IO=0mA) VCC Volts Open Drain
47k Pull Up to VCC
5 volts ±3%
VOL(IO=0mA) 0.4 Volts
21 IO2 I Digital No Programmable
Function I/O 2		 VIH 0.7*V
CC		 VCC Volts 47k Pull Up to VCC
5 volts ±3%
VIL VSS 0.8 Volts
Input Impedance 47k
O VOH(IO=0mA) VCC Volts Open Drain
47k Pull Up to VCC
5 volts ±3%
VOL(IO=0mA) 0.4 Volts
22 IO3 I Digital No Programmable
Function I/O 3		 VIH 0.7*V
CC		 VCC Volts 47k Pull Up to VCC
5 volts ±3%
VIL VSS 0.8 Volts
Input Impedance 47k
O VOH(IO=0mA) VCC Volts Open Drain
47k Pull Up to VCC
5 volts ±3%
VOL(IO=0mA) 0.4 Volts
23 IO4 I Digital No Programmable
Function I/O 4		 VIH 0.7*V
CC		 VCC Volts 47k Pull Up to VCC
5 volts ±3%
VIL VSS 0.8 Volts
Input Impedance 47k
O VOH(IO=0mA) VCC Volts Open Drain
47k Pull Up to VCC
5 volts ±3%
VOL(IO=0mA) 0.4 Volts
24 IO5 I Digital No Programmable
Function I/O 5		 VIH 0.7*V
CC		 VCC Volts 47k Pull Up to VCC
5 volts ±3%
VIL VSS 0.8 Volts
Input Impedance 47k
O VOH(IO=0mA) VCC Volts Open Drain
47k Pull Up to VCC
5 volts ±3%
VOL(IO=0mA) 0.4 Volts
25 IO6 I Digital No Programmable
Function I/O 6		 VIH 0.7*V
CC		 VCC Volts 47k Pull Up to VCC
5 volts ±3%
VIL VSS 0.8 Volts
Input Impedance 47k
O VOH(IO=0mA) VCC Volts Open Drain
47k Pull Up to VCC
5 volts ±3%
VOL(IO=0mA) 0.4 Volts

Note on pin 8: The Kenwood documentation did not give a Unit - didn't say volts, millivolts, anything. The field was blank.

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Hand-coded HTML © Copyright date of last edit by Mike Morris WA6ILQ.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.