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The mobile 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) can be
connected to the mobile radio. Support for MDTs or host computers is a programmable option per radio.
Additionally, radios programmed for host computers can also be programmed for data only operation (no
voice calls transmitted or received).
Turn power to the radio OFF before connecting or disconnecting any cables, including
the data cable. Also, turn power to the radio OFF when docking or undocking a
connected laptop computer. Failure to turn the power OFF can damage the radio,
requiring service by a M/A-COM approved service center.
12.10.1 Displays
The following will be displayed on the control unit during the various states of data mode of
operation.
TX DATA
Displayed on bottom line of display when the radio is transmitting a data call.
RX DATA
Displayed on bottom line of display when the radio is receiving a data call.
DATA OFF
Displayed on top line of display when the radio is in the data disabled state.
DATA ON
Displayed for two seconds on top line of display when the radio is toggled to the
data enabled state.
12.10.2 DATA OFF Operation
The radio can be placed in the data disable state by any of the following methods. When the data
state is disabled, the control unit displays "DATA OFF" on the top line. An ongoing data call is
allowed to complete except when an emergency is declared.
• Removing the microphone from the hookswitch (hookswitch option must be enabled by pre-
programming).
• Declaring an emergency (not to be used unless an actual emergency condition exists). Alert
tone will sound.
• Pressing the o button (System Model) or O(Scan Model) (pre-programmed). Alert
tone will sound.
• Selecting the function using the m button (pre-programmed).
• Pressing the ND button (System Model Only) (pre-programmed).
12.10.3 DATA ON Operation
The data state is enabled by one of the following (depending on how it was disabled). "DATA
ON" will be displayed top line of display for 2 seconds then the display returns to normal.
• Replacing the microphone into the hookswitch (going on-hook). Only valid if the “DATA
OFF” operation was entered by removing the microphone from the hookswitch (going off-
hook).
• Pressing the ND key toggles data state ON or OFF.
• Clearing an emergency, but valid only if an emergency caused “DATA OFF” operation.