Data Protocols - Philips SM40 Instructions For Use Manual

6. REMOTE PROGRAMMING 1/O PROTOCOL
6.2

Data Protocols

6.2.1 Login Protocol - Login of an external computer
6
6.2.2 Logout protocol - Logout of an external computer
6-2
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
improve readability and are not transmitted nor part of the command codes). An ASCII character table is
provided at the end of this chapter.
String to be sent:
This is the signal to the SM40 system that an external computer is connected.
The SM40 system will respond with this message:
The represents a space (20
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.
Status character Bits (3, 2, 1, 0)
0 0000
1 0001
2 0010
3 0011
4 0100
5 0101
6 0110
7 0111
8 1000
9 1001
A 1010
B 1011
C 1100
D 1101
E 1110
F 1111
Login will enable the system to transmit stored logs and errors.
It is not required to log in to enable the other commands.
String to be sent:
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:
/
2 Hex; 'ETX' is actually 0
STX-SM 40 SYSTEM Version:7.xx
/
Hex).
Bits
Byte 1
bit 3
bit 2
bit 1
bit 0
Byte 2
bit 3
bit 2
bit 1
bit 0
/
3 Hex. Dashes ('-') are only added to
STX-C-O-N-ETX
Date:xx-xx-xx-[system status]-ETX
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
STX-D-I-S-ETX
STX-A-C-K-ETX