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time; however, either data or voice is selected transparently by the operator through normal usage of the
radio. Data communications is not supported in the conventional mode.
The radios can be connected to Mobile Data Terminals (MDT) or to a host computer. Any RS-232
compatible device that supports the Radio Data Interface (RDI) protocol (Version 1.91 or greater) may be
connected to the radio. Support for MDTs or host computers is a programmable option per radio.
Additionally, radios may also be programmed for data only operation (no voice calls transmitted or
received).
8.29.1 Displays
The following will be displayed during the various states of data mode of operation:
TX DATA Appears on top line of display when the radio is transmitting a data call.
RX DATA Appears on top line of display when the radio is receiving a data call.
DATA OFF Appears on top line of display when the radio is in the data disabled state.
DATA ON Appears for two seconds on top line of display when the radio is toggled to the data
enabled state.
8.29.2 DATA OFF Operation
The radio can be placed in the data disabled state by any of the following methods. When the data state is
disabled, DATA OFF appears on the top line of the display.
• Declaring an emergency (not to be used unless an actual emergency condition exists). Alert tone will
sound.
• Pressing the OPTION button (if pre-programmed for “no data” key). Alert tone will sound.
• Pressing the “no data” (ND) key (pre-programmed).
8.29.3 DATA ON Operation
The data state is enabled by one of the following (depending on how it was disabled). DATA ON will
appear on the top line in the display for two seconds then the display will return to normal.
• Pressing the “no data” (ND) key toggles data state ON or OFF.
• Clearing an emergency. (Valid only if the emergency caused “Data OFF” operation.)
8.29.4 Exiting Data Calls
Under normal conditions, the radio enters the scan lockout mode and returns to the control channel after
completion of a data call (transmit or receive). If, during a data call, one of the following conditions
occurs, the data call is immediately terminated and the radio performs the desired function:
• PTT is activated.
• Emergency is declared by pressing the pre-programmed emergency button.
• A group or system is changed.