User's Manual

Technical Manual Appendices
7.3 CN3 DB25 Female Digital I/O Connector
Each CMOS logic input is protected by a 10K Ohm series resistor to the input
of the logic chip. There is also a 10K Ohm pull up/down resistor at each input
so as to default the input value to that set by JMP19. Each logic output is
protected by a 1K-Ohm series resistor from the output of the logic chip.
Pin No Function
13 DIGITAL EARTH or +5VDC output. JMP15 selectable.
25 INPUT PORT A. 8-bit Logic Input bit 0. (Power control bit 0)or Digital
CTCSS Control bit 0
12 INPUT PORT A. 8-bit Logic Input bit 1. (Power control bit 1)or Digital
CTCSS Control bit 1
24 INPUT PORT A. 8-bit Logic Input bit 2. (RX CTCSS control)or Digital
CTCSS Control bit 2
11 INPUT PORT A. 8-bit Logic Input bit 3. (TX CTCSS control)or Digital
CTCSS Control bit 3
23 INPUT PORT A. 8-bit Logic Input bit 4. (N/W address bit 0)
10 INPUT PORT A. 8-bit Logic Input bit 5. (N/W address bit 1)
22 INPUT PORT A. 8-bit Logic Input bit 6. (N/W address bit 2)
9 INPUT PORT A. 8-bit Logic Input bit 7. (N/W address bit 3)
21 INPUT PORT B. Channel Select BCD Units bit 0. / Binary Bit 0.
8 INPUT PORT B. Channel Select BCD Units bit 1. / Binary Bit 1.
20 INPUT PORT B. Channel Select BCD Units bit 2. / Binary Bit 2.
7 INPUT PORT B. Channel Select BCD Units bit 3. / Binary Bit 3.
19 INPUT PORT B. Channel Select BCD Tens bit 0. / Binary Bit 4.
6 INPUT PORT B. Channel Select BCD Tens bit 1. / Binary Bit 5.
18 INPUT PORT B. Channel Select BCD Tens bit 2. / Binary Bit 6.
5 INPUT PORT B. Channel Select BCD Tens bit 3. / Binary Bit 7.
17 OUTPUT PORT C. 8-bit Logic Output bit 7.
4 OUTPUT PORT C. 8-bit Logic Output bit 6.
16 OUTPUT PORT C. 8-bit Logic Output bit 5.
3 OUTPUT PORT C. 8-bit Logic Output bit 4.
15 OUTPUT PORT C. 8-bit Logic Output bit 3.(Digital CTCSS Control bit 3)
2 OUTPUT PORT C. 8-bit Logic Output bit 2. (Digital CTCSS Control bit 2)
14 OUTPUT PORT C. 8-bit Logic Output bit 1. (Digital CTCSS Control bit 1)
1 OUTPUT PORT C. 8-bit Logic Output bit 0. (Digital CTCSS Control bit 0)
Table 7-4 CN3 Connections
© SPECTRA ENGINEERING 2008 Revision 4.3.1B
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