Technical information

Troubleshooting and Repair
89
The following is a PMS message format that enables a telephone’s
message waiting lamp.
Message Formats from PBX to PMS
Maid in Room status
Maid in Room status is sent as a 10-character message, as follows:
_ _ _ _ _ _ _ _ _ _
function code STS
status code n
space (n is assigned room status code)
station number nnnnn (with trailing spaces)
Message Registration of Outgoing Trunk Calls
Message Registration of Outgoing Trunk Calls status is sent as a
12-character message, as follows:
_ _ _ _ _ _ _ _ _ _ _ _
function code MR
space
status code nnnn (nnnn is a 4-byte peg count)
station number nnnnn (with trailing spaces)
PBX and PMS 5-digit Extension Number Formats
The extension number is sent between the PBX and the PMS as a 5-digit
number. Numbers that are fewer than 5 digits include spaces:
PBX to PMS extension number nnnnn with trailing spaces
PMS to PBX extension number nnnnn with leading spaces
^B
MW
space
1
space
space
212
9
^C
Start Transaction
STX
The CTRL (^)
B character sig-
nals the start of
a PMS message
End Transac-
tion ETX
The CTRL (^) C
character signals
the end of a
PMS message
Function Code
The MW fol-
lowed by a space
indicates that the
PMS requests a
message waiting
function
Status Code
1 followed by
a space turns
on the mes-
sage waiting
lamp. 0 turns
the lamp off
Station’s Extension
(Room) Number
Identifies the exten-
sion number of the
telephone on which
the message waiting
lamp lights. The PMS
inserts leading
space(s) to indicate
that no number is
present