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Interface Definition Service Manual

Table 6-4 Definition of 20-Pin Option Board Interface

16-Pin Accessory Interface

Pin No. Name Function Valid Level

1 GND Ground (analog & digital) /

2 SPK- External speaker- /

3 SEL1-Accessory Accessory identifier 1 L

4 SEL2-Accessory Accessory identifier 2 L

5 Emergency Emergency L

6 SPK+ External speaker+ /

7 USB+ / RTS USB+ / RTS /

8 USB- / CTS USB- / CTS /

9 SWB+ Power supply for the interface /

10 MIC- External MIC- /

11 GPIO GPIO /

12 MIC+ External MIC+ /

13 SEL3-Accessory

Accessory identifier 3 or 1-wire

communication interface

14 TX TX end of serial port communication /

15 RX RX end of serial port communication /

16 PTT TX control L

Table 6-5 Definition of 16-Pin Accessory Interface

Definition of Accessory Identifiers

No. OPT_SEL1 OPT_SEL2 OPT_SEL3 Definition

1 0 0 0 Reserved

2 0 0 1 Reserved

3 0 1 0 USB master mode for the radio

4 0 1 1 For connecting earpieces

Hytera PD78XG Service Manual

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