Instruction manual

32 Chapter 4 Technical Information
radio. If it receives a PTT ANI from a portable radio programmed for
format F, the radio display will show only the unit ID.
If Aliases are used, the right most character in the display will be
used to show the descriptor (M or P). If the radio has an 8 character
display and the programmed alias has 8 characters, the right most
character of the alias will be blanked and the descriptor will be
shown in its place.
For system types I through P, the VMDE-200 looks for a match in the
T1 and T2 bits. If the bits match then the VMDE-200 will react to the
received message. If not, the message is ignored. This is for
communications systems that have multiple unrelated users so that
different users do not see ID’s from other users.
MDC-1200® Message Type
To increase flexibility of the VMDE-200 and enhance compatibility
with existing communications systems, the format of encoded MDC-
1200® messages can be modified. The default message type for a
PTT ANI is represented by 0x8001 and the default message type for
an Emergency ANI is 0x8000. These parameters should not be
changed without a thorough understanding of the signaling system
and existing signaling codes.