SECTION 3. INSTRUMENTATION INSTALLATION
3-11
1.
Remove the four screws that attach the
lid to the MD9. Remove the lid, and the
single screw that attaches the circuit
board to the base. Remove the board
and mount the base to the enclosure
backplate using the two screws and
nylon grommets provided.
2.
Set the dip switches on the circuit board
to the appropriate Station ID (Table 3.3-
2). Each MD9 must have a unique ID;
address 1 is usually used for the MD9
at the computer, address 2 for the next
MD9, address 3 for the next MD9, etc.
The default baud rate is 9600, which
can be changed with the jumpers next
to the dip switches (Table 3.3-2).
3.
Reassemble the circuit board and lid
using the screws previously removed.
4.
Route the coaxial cable(s) to the MD9.
Connect the cable(s) to the MD9 using
the BNC "T" provided. The first and last
MD9s of the network must be
terminated with 75 ohm Coax
Terminators (Model MD9CT) to prevent
signal reflection.
5.
Connect the green ground wire to the
"
" terminal on the MD9, and to
datalogger ground. Connect the MD9
to the datalogger with an SC12 cable.
3.3.6.2 MD9 Multidrop Interface at the
Computer
Connect the MD9 and the SC532 9 Pin
Peripheral to RS232 Interface to the computer
as shown in Figure 3.3-9.
1.
Connect the SC532 to the computer's
serial port using an SC25PS cable for a
25-pin serial port, or a PN7026 cable for
a 9-pin serial port. Connect the MD9 to
the SC532 with an SC12 cable.
2.
Route the coaxial cable to the MD9;
connect the cable and an MD9CT to the
MD9 using the BNC "T" provided.
MADE IN THE
USA
AC INPUT
57 - 63 Hz
FOR USE AT 100 120
230-240
JUMPER
1&2
1&3
1&2
1&3
2&3
2&3
1&4
1&5
1&4
1&5
APPLY AC
MAX (CURENT)
FUSE RATING
.5A
.25A
!
EXTERNAL FUSE RECOUNTER
EXIT
IHB12-1.7
OUTPUT:
12DC AT
1.7 AMPS
I P
POWER
INTERNATIONAL
2N3055
MEXICO
92109
+12V
FCC ID: ATH90F0233420050
E.F.JOHNSON CO. U.S.A.
DL 3420
E.F. JOHNSON CANADA INC.
mfg by E.F. JOHNSON USA
DOC T.A. 89178
Serial No3400T144A 17858
FIGURE 3.3-7. RF232 Base Station Installation
PS12 POWER SUPPLY
WITH 12V CHARGING REGULATOR
MADE IN USA
WARNING:
PERMANENT DAMAGE TO RECHARGEABLE
CELLS MAY RESULT IF DISCHARGED
BELOW 10.5 VOLTS
FUNCTION
INT
EXT
BAT
CHG
OFF
ON
CHG
CHG
+12
+12
PS12 BATTERY
EXTERNAL BATTERY - DO NOT USE WITH
INTERNAL RECHARGEABLE BATTERY
CHARGE VOLTAGE PRESENT
INPUT FROM CHARGER OR SOLAR PANEL
16-26 VDC OR AC RMS: POSITIVE TO
EITHER TERMINAL, NEGATIVE TO OTHER
POWER TO DATALOGGER OR
12V PERIPHERALS
SE
DIFF
G G H
L
1
2
1
AG H
L AG H
L AG E1 AG E2 G
3
4
2
5
6
3
SE
DIFF
G G H
L
7
8
4
AG H
L AG H
L AG E3 AG G G
9
10
5
11 12
6
P1 G P2
G C8 C7 C6 C5 C4 C3 C2 C1
G 12V 12V
SDM
5V 5V G
G
SW 12V
SW 12V CTRL
Logan, Utah
G 12V
G 12V
POWER
IN
CR10X WIRING PANEL
MADE IN USA
WIRING
PANEL NO.
EARTH
GROUND
CS I/O
CAMPBELL
SCIENTIFIC
INC.
MD9
MULTIDROP INTERFACE
MADE IN USA
SERIAL I/O
COAX
FIGURE 3.3-8. MD9 Multidrop Interface
Antenna Cable
Serial Port
Radio
Power
Switch
12 V and G
Terminals
SC12
Ground
Wire
MD9CT
BNC "T"
MD9
75 Ohm
Coax
Blue Ribbon Cable
Cable from radio