CHAPTER 5
ND-45895 (E)
Page 38
Revision 1.0
SPECIFICATIONS
3. DATA TRANSMISSION PROTOCOL
Table 5-2
shows the transmission control codes used for the data exchange between the PBX and the VMS.
3.1 General Message Format
Figure 5-1
shows the MCI general message format:
Figure 5-1 MCI General Message Format
Table 5-2 Data Transmission Protocol
CODE
DESCRIPTION
SA
System Address: ASCII code 31
16
(digit “1”) or 30
16
(digit “0”)
UA
Unit Address: ASCII code 21
16
(exclamation point “!”)
STX
Indication of the start of message text: ASCII code 02
16
(
)
ETX
Indication of the end of message text: ASCII code 03
16
(
♥
)
EI
Entry Index – Describes the type of message being sent (A)
)
S
T
X
S
A
U
A
E
I
E
T
X
Message Text
Key:
STX
Start of Text
SA
System Address
UA
Unit Address
EI
Entry Index
ETX
End of Text
