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to change the parameters or the attachment state of an existing group or groups in the
terminal.
The assignment may require the terminal to immediately attach the group, change its Alias or Class
of Usage or to just add it to the talkgroup list allowing it to be attached later.
The following requirements apply to each group element in the SS-DGNA Assign PDU. If there are
multiple groups in the PDU, the acknowledge for all groups is sent together in one PDU.
For each assigned group, there is an assignment that is a command to add the group to the
terminal's group list, and may contain instructions to attach the group. The terminal can accept or
reject the assignment. On accepting the assignment the terminal can either accept or reject the
attachment.
Assignment with Auto-select
If Auto-Select Single Assigned Group is enabled, upon receipt of an individually addressed
DFACILITY PDU containing a DGNA assignment which contains a single group assignment without
an attachment (that is, the Attachment Mode is set to Not Attached, MS user allowed to request
attachment), the terminal processes the assignment as described above, and then automatically
makes that group the selected group (that is 'auto-select'). Specifically, if this group had not already
been the selected group before the assignment was received, the terminal shall send the group
attachment for this group as if the user had manually chosen this group to be the selected group.
The group shall remain the selected group until the user or the SwMI subsequently change the
selected group.
Auto Reselect of Previous Group
When a group is auto-selected, and is then subsequently de-assigned or detached by the SwMI
while the auto-select group is still currently the selected group, the terminal shall automatically
reselect the group previously selected explicitly by the user. However, if the user manually changed
the selected group after auto-select and then subsequently reselects the auto-select group, or if
there was never a user-selected group, the behaviour on de-assign of the group shall be as the
behaviour with any other group.
No Auto-select with Multiple Groups
If the terminal receives an appropriate PDU containing DGNA assignments for more than one
group, it shall be treated as a normal DGNA assignment, and the auto-select parameter shall have
no effect on any of the groups.
No Select of Non-selectable
If the single assigned group already exists in the talkgroup list and is defined as non-selectable' as
defined, the terminal shall not auto-select the group.
Assign of Non-tactical Emergency Group
If an assignment for the group that is already defined in the codeplug as the non-tactical Emergency
group is received, the terminal shall update the name of the non-tactical group with the group name
received in the assignment. The terminal shall also treat this as a normal assignment and add the
group to the talkgroup list or modify the parameters of the group if already in that list.
De-assign of Non-tactical Emergency Group
If a de-assignment for the group that is defined as the non-tactical Emergency group is received, the
terminal shall remove it from the talkgroup list if it is also defined there, but it shall remain as valid for
use for non-tactical Emergency group calls.
Auto-select in Non-tactical Emergency Mode
If an assignment is received with Auto-Select Single Assigned Group (enabled) in Non-tactical
Emergency Mode, the assignment shall be accepted as normal, but auto-select shall not be
6866588D21-D
Chapter 3 - MTP850 Ex/MTP810 Ex Product Information Manual
Customer Programming Software (CPS)
March 2009
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