SECTION 3. INSTRUMENTATION INSTALLATION
3-12
CAMPBELL
SCIENTIFIC
INC.
MD9
MULTIDROP INTERFACE
MADE IN USA
SERIAL I/O
COAX
FIGURE 3.3-7. MD9 Multidrop Interface
in MetData1
TABLE 3.3-2 Station ID Numbers and
Corresponding Switch Settings
9600 Baud
1200 Baud
300 Baud
A-B Short
A-B Open
A-B Short
C-D Short
C-D Short
C-D Open
Station
Switch Settings
ID
1234
5678
0
0000
0000
1
1000
0000
2
0100
0000
3
1100
0000
4
0010
0000
5
1010
0000
6
0110
0000
7
1110
0000
8
0001
0000
9
1001
0000
10
0101
0000
11
1101
0000
12
0011
0000
*255
1111
1111
NOTE: Addresses 1-254 are valid for an
MD9 connected to a datalogger or computer.
Address 255 is used only when the MD9 is
connected to a telephone modem.
SC12 Cable
Ground Wire
Must be
Installed
Coaxial Cable to
Bulkhead Connector
MD9
Position of Installed
Coaxial Bulkhead
Connector