Tait TOP, Руководство по эксплуатации и обслуживанию

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28 Tait Orca Portable (TOP) Encryption Midian Encryption Programming and Service Manual
June 2006 © Tait Electronics Limited
An addressable latch on the radio User Interface board is replicated on the
encryption flex and driven by the same serial data bus. The radio micro
uses four outputs of this latch to control the encryption code select bus.
Two other outputs provide the PTT and Mode drives to the module. The
remaining two pins function as normal for the User Interface board and are
unused on the flex.
The external PTT and internal PTT are combined within the radio
software to provide the PTT for the module.
The module IND (status) output is fed to the SENSE-1 input to the radio
micro. This allows the software to display the status on the LCD accessory
annunciator. On TOP radios with no display (T5010 and T5030), the radio
LED indicates encryption ON/OFF.
Encryption Mode can be assigned to a function key when the radio is
programmed, or through a menu. (On most radios, this function is user-
programmable.) This can be a long or short press of any valid function key,
usually a short press of F2 key. Encryption code control is achieved by
keypad entry or menu, usually a long press of F2 key.