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MD9 Coax Multidrop Interface - Page 1
INSTRUCTION MANUAL
MD9 Multidrop Interface
Revision: 5/03
Copyright (c) 1987-2003 Campbell Scientific, Inc.
MD9 Coax Multidrop Interface - Page 2
... obligation under normal use and service for twelve (12) months from defects in countries served by surface carrier prepaid. CAMPBELL SCIENTIFIC, INC. This warranty shall not apply to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products. Products may not be issued. RMA#_____ 815 West 1800 North Logan, Utah 84321-1784
CAMPBELL SCIENTIFIC, INC. does not accept...
MD9 Coax Multidrop Interface - Page 3
... and Datalogger Compatibility 3
4. Telephone to Computer 4
Figures
1-1 MD9 Multidrop Interface 2 2-1 System Description 3
i Cable Specifications and Source References...... SC532A D-1
Tables
1-1 Specifications 1 4-1 ID Settings for links to the printed version of Dataloggers and Coax Length 4
6. Operation 6
A. Setting the Station ID C-1
D. Maximum Number of this...
MD9 Coax Multidrop Interface - Page 4
ii
MD9 Multidrop Interface Table of Contents 4-1 ID Switch and Baud Rate Selection Jumpers 4 6-1 Telephone to MD9 Conversion 6 B-1 Break/Address Timing Diagram B-1 This is a blank page.
MD9 Coax Multidrop Interface - Page 5
... range: -25 to a network of Campbell Scientific dataloggers using Campbell Scientific's telecommunication software, the operation of the MD9 in the system is not possible.
The SC532(A) supplies +5 VDC power to the MD9 as well as a direct wire link between a computer and a Campbell Scientific datalogger via coax cable. A computer with the PC201 card installed could use the SC925 Cable...
MD9 Coax Multidrop Interface - Page 6
... is powered from the datalogger SERIAL I /O and Coax Connectors on the MD9.
When installing the MD9, a 16AWG or heavier wire should be terminated with the MD9) and is connected to allow for cable specifications and source references. "T" connectors on a branch. (Figure 2-1).
The MD9 at the MD9 on MD9s at the beginning (computer) and end (last datalogger) of the...
MD9 Coax Multidrop Interface - Page 7
... higher is set by the ID select switch (Figure 4-1). MD9 Multidrop Interface
FIGURE 2-1. Customers using older software may be accessed by contacting Campbell Scientific. Contact Campbell Scientific customer service if your datalogger requires this modification.
4. Appendix C gives a complete list of the four cover screws. The following dataloggers may purchase a software update for use...
MD9 Coax Multidrop Interface - Page 8
...
1200 Baud A-B Open C-D Short
300 Baud A-B Short C-D Open
FIGURE 4-1. Other baud rates may be set to 255 can operate reliably is dependent on 5,000 feet of Belden 9100 coax cable attenuates the signal by 0.2 db.
Each MD9 attenuates the signal by 0.6 db.
Maximum Number of Dataloggers and Coax Length
The maximum coax...
MD9 Coax Multidrop Interface - Page 9
... to maintain the battery voltage level. NOTE
In order to make measurements at PC) 30 db
6 db
43 db
6. The MD9 connected to the COM200 telephone modem must have the ID switch set to the MD9.
NOTE
A PS512M with an MD9. A Campbell Scientific Model COM200 Telephone Modem is used if AC is added to a COM port, the...
MD9 Coax Multidrop Interface - Page 10
...new BREAK. This remains true until the DTR and ME line are pulled low and the MD9 reverts to State 1 active. All other . When the datalogger detects the ring line signal it enters ... transmitted by the computer is passed on the network is pulled high, the MD9 goes from State 0 to the coax network. Upon detecting activity on the MD9s I /O port. If a BREAK is
6 The link is detected, all...
MD9 Coax Multidrop Interface - Page 11
... return to synchronize at the phone modem is in the datalogger instruction manual. When a station file is set to 255 and the MD9 is not the first Interface Device the telephone to MD9 conversion is sent by the computer, the computer's DTR line is set to the user.
7 To terminate communications with the computer via the...
MD9 Coax Multidrop Interface - Page 12
MD9 Multidrop Interface
This is a blank page.
8
MD9 Coax Multidrop Interface - Page 17
... configured for phone to MD9, PC208 DOS software cannot recognize an MD9 address greater than 127. Setting the Station ID
Each MD9, including the one in the MD9 base station, must have a unique Station ID. When a station is closed. Following is a list of all possible Station IDs with the corresponding setting of the dip switches.
SWITCHES...
MD9 Coax Multidrop Interface - Page 18
Appendix C. Setting the Station ID
SWITCHES ID 1234 5678
40 0001 0100 41 1001 0100 42 0101 0100 129 1000 0001 130 0100 0001 131 1100 0001 ...
MD9 Coax Multidrop Interface - Page 19
...insulation from datalogger and SC532A. 2. The correct barrel connector polarity is 17 VDC! The MD9 requires that the voltage polarity is correct on the outer sleeve. Application of AC adapter ... VDC. Unplug field cable from each wire and tin ends. 5. Cut off optional field cable's DB9, 2) replaced the factory AC adapter, or 3) built your own dc power cable, make sure that a minimum of the...
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