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Specifications of the MA 21
Service DIP switch
In order to activate the service mode DIP switch 3 must be set to the "ON" position. The
switch must always be in this position if commands are to be sent from a PC to the MA 21
via the service interface. If the switch is set to "OFF", you can passively listen the data.
o
n
1 2
Figure 3.8: Position of the DIP switch and the jumper in the service network
Notice!
To be able to configure the connected device (RS 232) directly via the service interface, DIP
switch 4 must also be set to "ON".
Attention!
Upon activation of the service mode the connection to the host computer is interrupted.
Data format of the service interface
If DIP switch 3 is set to "Service", the service interface always functions with the fixed data
format
• 9600 baud
• 8 data bits
• 1 stop bit
• no parity
• no handshake
ASCII address
Attention!
Please note that to communicate in the network, the Frame format/Address mode/ASCII
address option must always be activated and the correct address must be selected.
Data frame Structure
The data frame on the service interface is structured as follows:
ASCII
HEX
16
S
3 4
B
MA
Prefix 1
Addr. HI Addr. LO
STX
0
02h
30h
Data
1
CODE
31h
43h 4Fh 44h 45h
MA 21
Terminator 1 Terminator 2
CR
0Dh
0Ah
Leuze electronic
LF
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