Hytera HD705 - Table 6-6 Definition of Accessory Identifiers

Service Manual Interface Definition
31
No. OPT_SEL1 OPT_SEL2 OPT_SEL3 Definition
5 1 0 0 For connecting MODEM
6 1 0 1 For connecting remote speaker microphones
7 1 1 0
Programming cable (serial port)/
USB slave mode for the radio
8 1 1 1 No accessory
Table 6-6 Definition of Accessory Identifiers