Philips LBB 1330, Instructions For Use Manual

Page: 122 / 140

6. REMOTE PROGRAMMING 1/O PROTOCOL
6-2
6
6.2 Data Protocols
This chapter describes all available data protocols for communication between the SM40 System and a PC.
All command strings are three characters wide and are preceded by the ASCII ‘Start-of-Text’ (STX)
character, and are trailed by the ASCII ‘End-of-Text’ (ETX) character.
All characters in ASCII; ‘STX’ is actually 0
/
2 Hex; ‘ETX’ is actually 0
/
3 Hex. Dashes (‘-’) are only added to
improve readability and are not transmitted nor part of the command codes). An ASCII character table is
provided at the end of this chapter.
6.2.1 Login Protocol - Login of an external computer
String to be sent:
STX-C-O-N-ETX
This is the signal to the SM40 system that an external computer is connected.
The SM40 system will respond with this message:
STX-SM 40 SYSTEM Version:7.xx Date:xx-xx-xx-
[system status]
-ETX
The represents a space (20
/
Hex).
The [system status] is transmitted as 2 ASCII characters. Interpretation of these characters must be done on
bit-level. The table at the left shows the bit-values of the ASCII values of the status characters. The two
tables at the right show the interpretation of the individual bits of these characters.
Login will enable the system to transmit stored logs and errors.
It is not required to log in to enable the other commands.
6.2.2 Logout protocol - Logout of an external computer
String to be sent:
STX-D-I-S-ETX
This is the signal to the SM40 system that the external computer is disconnected. All transmissions from the
SM40 system to the PC (logging etc) will be inhibited until the PC had logged in again.
When receiving this command the system will reply with:
STX-A-C-K-ETX
Status character
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Bits (3, 2, 1, 0)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Bits
Byte 1
bit
3
bit
2
bit
1
bit
0
Byte 2
bit
3
bit
2
bit
1
bit
0
Meaning when value = 1
Logging enabled
Logging transmission enabled
32 x 32 Matrix configuration
Reserved
Meaning when value = 1
Selection station logging
enabled
Auto logging enabled
Logging only date, time, station
and key
Error transmission enabled