Operator's Manual

OM-E 2072-09689-00
A-5
Table A-1. Use of “@” Stuffing Symbol
Pattern Interpretation
A B C
“Standard” 3-character address word, shown here for reference. Only the station
with this address stops scanning and responds
A B @
“Stuff-1” reduced address field, used to add characters “A, B” at the end of the
address
A @ @
“Stuff-2” reduced address field, used to add character “A” at the end of the address
@ ? @
“AllCall” global address (see also Table A-2): all the stations stop and listen (unless
this function is inhibited)
@ A @
“Selective AllCall” global address: each station with the same last character “A”
stop scanning and listen (unless this function is inhibited
@ @ ?
“AnyCall” global address (see also Table A-2): all the stations stop scanning and
respond in randomly selected timeslots (unless this function is inhibited)
@ @ A
@ B@ (option)
“Selective AnyCall” address: each station with same last character(s) “A” (or “B”)
stops scanning and responds in a randomly selected timeslot (unless this function
is inhibited), using its own address
@ A B
@ C D (option)
“Double selective AnyCall” address: each station with same last characters “AB” (or
“CD”) stops scanning and responds in a randomly selected timeslot (unless this
function is inhibited), using its own address
@ @ @
“Null” address; all the stations ignore this address. The null address intended for
use in test and maintenance, or to create an extra “buffer” timeslot
A-6.2.2 Net Addresses
The purpose of a net call is to rapidly and efficiently establish contact with multiple prearranged (net)
stations. This is achieved by the use of a single net address.
The net address is actually an additional address assigned in common to all the stations that are
members of a specific net. Its address structure is identical to that used for individual station addresses
(basic or extended, with or without stuffing, as necessary).
When defining a net, each member station is automatically assigned a timeslot: by having each station
answer a call request in a different timeslot, collisions are avoided.
A-6.2.3 Group Addresses
The purpose of a group call is to rapidly and efficiently establish contact with multiple
non-prearranged (group) stations.
To make a group call, a calling ALE station uses a sequence of the actual individual station addresses
of the called stations.
A-6.2.4 Special Addressing Modes – Use of Wildcards
A “wildcard” is a special character,“?”, that a calling station can use to address multiple stations with a
single call address. The following rules apply:
• The total length of a calling address that includes wildcard(s) must be equal to that of the called
station addresses.
• A receiving station will accept a wildcard character as a substitute for the alphanumeric
character in its own address that occupies the same position. This means that the wildcard
character is a substitute for any of 36 characters and digits (A to Z, 0 to 9) in the Basic 38
character subset.
• Multiple wildcard characters can be used in different positions of the same address (basic or
extended).
See Table A-2 for examples of patterns using the “?” wildcard symbol.