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net data. The net data parameters are a selection of seconds have elapsed after the SEND key has been
TACFIRE or AIR NET, single block, double block, a pressed, the IDM will reset automatically and SEND
selection of baud rate, the radio, the preamble duration, must be pressed again. Voice transmission has priority
the monitor duration, and what authentication mode will over a digital transmission; therefore, the IDM will wait
be used. until the airway is clear of voice traffic if a monitor time
has been selected.
(a) Net Selection.  Eight nets are available
to be selected as either an AIR NET or TACFIRE NET (g) Authentication (AUTH) Select.  Select
(air elements can “talk” on a TACFIRE NET but between MANUAL authentication or NONE. If MANUAL
TACFIRE will not get all required data if defined in an is selected, an operator input of the transmission
AIR NET). All aircraft working together in the same authenticator is required each time transmission is
team/broadcast should select AIR NET. If there is a attempted. If NONE is selected, no authentication is
requirement for an aircraft to “talk” to artillery, the required. This function automatically displays NONE
artillery should be defined in a separate TACFIRE NET. due to use of automatic authentication. Manual
authentication is normally only used in air-to-air or air(
b) Block (BLK) Selection.  Select to-ground communication but not air-to-TACFIRE. If
between single (SGL) block or double (DBL) block type MANUAL is selected, but no manual authentication is
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TM 1-1520-248-10
desired at the time of transmission, the message will be TEXT). By transmitting this message, the TACFIRE
sent on the second press of the SEND button. operator can see the anticipated next table line and
(2) Subscribers (SUBS). Subscriber net adjust the computer. A not acknowledged (NAK) will
assignments are required. Each net can be made up of appear; however, momentarily normal digital
15 common subscribers (a section or platoon for communication s h o u l d be r e s t o r e d w i t h t h e
example). Team and broadcast identifiers must be authentication tables in proper sequence.
included in a subscriber net for the IDM to recognize
them, i.e., team and broadcast cannot be entered on (4) Preset Messages. There are six preset
Start page 1/3 until defined in the subscriber nets. The messages that can be programmed prior to the start of
originator is automatically in all of the defined a mission to aid in response time for transmissions.
subscriber nets. A TACFIRE subscriber must be in a There are six preset movement packages that can be
TACFIRE net. As the message originator, a subscriber programmed for establishing phase lines, assembly
from any defined net may be selected and IDM will areas, FARP locations, etc. These 6 preset movement
automatically set to that net data. However, a messages consist of 2 lines of 15 characters each for a
subscriber using another set of net data would not be total of 30 characters.
able to establish contact without resetting net data to
match the originator. Should SUB appear, it signifies (5) BULK Data Load. Bulk data load can be
that the subscriber selected as the destination is not used by a team member who did not preprogram the
defined in the subscriber list. IDM prior to flight or for an IDM that needs to be
reprogrammed while in flight. The data that can be bulk
NOTE loaded from another IDM consists of: subscribers/nets,
preset messages, preset movement messages, receive
Because the IDM expands the number of automatic authentication table, and transmit automatic
subscribers per net to 15 (ATHS supports authentication table.
only 9) two-digit subscriber IDs must be
entered (i.e., - 00 - 0Z, 10 - 1Z, etc.). To
communicate with ATHS or TACFIRE c . START Page 3/3. This page allows for
subscribers, the originator and destination configuration of the RAPID function and the
subscriber IDs must be in the range 00-0Z. Serialization Subscriber function. The AUTO SHOT
In other words, i f an ATHS-equipped function is displayed but is not functional in this
platform has selected a subscriber ID of installation. The Start 3/3 page is used to program the
“A”, a subscriber “0A” should be entered in programmable RAPID function. The L-1 key allows the
the appropriate net. In addition, an operator to select one of five options to provide quick
originator ID on the IDM-equipped aircraft access to various pages. The five options are as
must be within the range 00-09, 0A-0Z. (In follows: LAST MSG, AIR MSN, ARTY MSN, MAYDAY,
the example given “0A” should be the and MENU.
originator chosen for the IDM-equipped
aircraft since the ATHS-equipped platform (1) LAST MSG (Last Message) programs the
　
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