Port |
Pin |
Name |
Function |
2.0 |
9 |
Signalling Decode |
Input from the RX Comparator (1-Bit "ADC") |
2.1 |
10 |
Data |
Synchronous serial Bus (EEPROM, PLL, Shift Register) Data |
2.2 |
11 |
Clock |
Synchronous serial Bus (EEPROM, PLL, Shift Register) Clock |
2.3 |
12 |
SCI RX |
UART/RS232 Rx From Control Head |
2.4 |
13 |
SCI TX |
UART/RS232 Tx To Control Head |
2.5 |
14 |
T/R Shift |
VCO (RX/TX) Switch 0=Tx, 1=Rx |
2.6 |
15 |
Alert Tone |
Towards Audio PA, 1-Bit-DAC for local audio |
2.7 |
16 |
Shift Reg Latch |
Towards Shift Register Latch Input, Latest 8 bits from serial bus are latched in on positive edge |
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5.0 |
17 |
Emergency |
From rear Sub-D connector, Input 0 = 0 V on pin 9. FSK-Mod cuts this connection and rewires Sub-D pin 9. |
5.1 |
18 |
Power Fail |
From 9.6 V Regulator, 1=Power Fail (Input voltage < 9,8 V) |
5.2 |
19 |
SW B+ |
From rotary switch on control head, 1 = radio powered |
5.3 |
20 |
Ext. Alarm |
Towards rear Sub-D connector, Open Collector output, 1 = Output 0 V, MC70 uses this to signal the squelch condition |
5.4 |
21 |
HUB/PGM |
From rear Sub-D connector and Control Head/Microphone (Hub Switch), signals suspended microphone |
5.5 |
22 |
Lock Detect |
0 V = PLL locked |
5.6 |
23 |
SQ Det |
From Carrier Squelch, 1 = Signal exceeds threshold |
5.7 |
24 |
RSSI |
From RSSI Board / Squelch, 1 = Signal exceeds threshold |
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6.0 |
25 |
Key 3/4 Detect |
From Control Head, connected to Port 2.3/SCI RX |
6.1 |
26 |
Key 1 |
From Control Head, connected to Port 2.4/SCI TX |
6.2 |
27 |
Key 2 |
From Control Head, connected to Port 6.4/#Test |
6.3 |
28 |
Syn Latch |
Towards PLL, rising edge latches data from serial bus into PLL register |
6.4 |
29 |
Yel LED/#Test |
Output towards Control Head and Input from test pin (TEST) |
6.5 |
30 |
Signalling Encode D/A MSB |
Tx audio signalling Bit 1 |
6.6 |
31 |
Signalling Encode D/A LSB |
Tx audio signalling Bit 0 |
6.7 |
32 |
PTT |
From Control Head, 1 = PTT active |