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  Connector Pinouts of various Scom Controllers
By Mike Morris WA6ILQ
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Skip down for the model 7330 series pinouts

Scom 5K, 6K and 7K Controller Connectors
Pin 5K Connector 6K Connector 7K J2 Connector
(DB25 Female)
7K J3 Connector
(DB25 Male)
1 Logic In 1 Logic In 1 Receiver#1 Audio In Logic In #1
2 Logic In 2 Logic In 2 Receiver#1 COR In Logic In #2
3 Logic In 3 Logic In 3 Receiver#2 COR In Logic In #3
4 receiver #1 CTCSS In receiver #1 CTCSS In receiver #3 COR In Logic In #4
5 receiver #2 COR In receiver #2 COR In receiver #1 CTCSS In Logic In #5
6 receiver #1 COR In receiver #1 COR In receiver #2 CTCSS In Logic In #6
7 Logic Out 1 Logic Out 1 receiver #3 CTCSS In Phone Line Busy In *
8 Logic Out 2 Logic Out 2 receiver #2 Audio In Logic Out #1
9 Logic Out 3 Logic Out 3 CTCSS Freq#1 Out Logic Out #2
10 TX PTT Out TX PTT Out TX#1 PTT Out Logic Out #3
11 TX Audio TX Audio TX#2 PTT Out Logic Out #4
12 receiver #2 Audio receiver #2 Audio CTCSS Freq#2 Out Logic Out #5
13 receiver #1 Audio receiver #1 Audio CTCSS Freq#3 Out Logic Out #6
14 Ground Ground Transmitter#1 Audio Out Logic Out #7
15 Ground Ground Transmitter#2 Audio Out Phone Line Busy Out *
16 Ground receiver #2 CTCSS In CTCSS Freq#4 Out FC1 Out
17 Ground Ground CTCSS Freq#5 Out FC2 Out
18 Ground DC Power In CTCSS Freq#6 Out FC3 Out
19 Ground Ground Ground +5V Test
20 Ground Ground Ground +10V Test
21 Ground Ground Ground +12V Test
22 Ground Ground Ground Ground
23 Ground Ground CTCSS Encoder In Ground
24 Ground Ground CTCSS Encoder Out Ground
25 Ground Ground receiver #3 Audio In Ground

* Note: When using any revision of the Version 2.04 firmware in a 7K the function of pin 7 can be reassigned to Logic In #7, and pin 15 can be reassigned to Logic Out #8.


The 7330 has a separate DB9 connector for each radio port, and a DB25 for signals common to the entire controller. The two serial ports are wired differently, Serial Port #1 is wired as DTE, #2 is wired as DCE and does not. For more details Google "DCE and DTE". You can run a plain extension cord from your computer's DB-9 serial port and serial port #2 (as long as it has pins 2, 3 and 5. There is no connection to pin 9 on the serial port as a normal connection does not use it.

Numbers in square brackets [ ] reference table notes at the end of the table.

Scom 7330 Controller Connectors
Pin I/O Connector
DB25 Female
Radio Connector
(one DB9 Female per radio port)
Serial Connector #1
DB9 Male
Serial Connector #2
DB9 Female [1]
1 Logic Output #1 Receiver Audio Input Carrier Detect (DCD)[2] Carrier Detect (DCD) - No connection
2 Logic Output #2 Receiver COR Logic Level Input Receive Data (RXD) Receive Data (RXD)
3 Logic Output #3 Receiver CTCSS or DCS decoder Logic Level In Transmit Data (TXD) Transmit Data (TXD)
4 Logic Output #4 Transmitter PTT Out Data Terminal Ready (DTR)
Not implemented as a signal, jumpered to pin 6 inside the unit
Data Terminal Ready (DTR)
Not implemented as a signal, jumpered to pin 6 inside the unit
5 Logic Output #5 Transmitter Audio Out Data Ground Data Ground
6 Logic Output #6 Ground for Receiver Audio Data Set Ready (DSR)
Not implemented as a signal, jumpered to pin 4 inside the unit
Data Set Ready (DSR)
Not implemented as a signal, jumpered to pin 4 inside the unit
7 Analog In #3 Ground CTCSS Audio (see pin 8) Request To Send (RTS) [2] Request To Send (RTS)
Not implemented as a signal, jumpered to pin 8 inside the unit
8 Analog In #2 Transmitter CTCSS Audio Encoder or a Logic Level Out   (jumperable, see note 2) Clear To Send (CTS) [2] Clear To Send (CTS)
Not implemented as a signal, jumpered to pin 7 inside the unit
9 Analog In #1 Ground for Transmitter Audio Ring Indicate (RI) - No Connection Ring Indicate (RI) - No Connection
10 Logic Input #1 Not Applicable Not Applicable Not Applicable
11 Logic Input #2
12 Logic Input #3
13 Logic Input #4
14 Logic Output #7
15 Logic Output #8
16 Ground
17 Ground
18 Ground
19 Ground
20 Ground
21 Ground
22 Ground
23 Ground
24 Ground
25 Ground
Table notes:
1) When Serial connection #2 is configured as the Console, you can connect it to a 9-pin serial port on a PC using a 9-pin serial straight-through cable (a DB-9 extension cord).
2) Pin 8 of each radio port can be either a CTCSS encoder or a logic level to control the factory encoder in the transmitter. The selection is controlled by a jumper on each port - J37 (port 1), J38 (port 2) and J39 (port 3). The factory default is that the CTCSS encoder audio is connected.

Contact Information:

The author can be contacted at: his-callsign // at // repeater-builder // dot // com.



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Table data above is from the Scom manuals.
Artistic layout, text and hand-coded HTML © Copyright 2005 and date of last update by Mike Morris WA6ILQ
This page originally posted on Monday 03-Feb-2005

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.