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MD485 RS-485 Multidrop Interface - Page 1
MD485 RS-485 Multidrop Interface
Revision: 10/10
Copyright © 2003-2010 Campbell Scientific, Inc.
MD485 RS-485 Multidrop Interface - Page 2
... returned to modification, misuse, neglect, accidents of the problem, an RMA number will not process any Campbell Scientific, Inc. This warranty shall not apply to 435-750-9579. Warranty and Assistance
The MD485 RS-485 MULTIDROP INTERFACE is available from our website at www.campbellsci.com/repair. Campbell Scientific's shipping address is limited to contaminants that may...
MD485 RS-485 Multidrop Interface - Page 7
The MD485 device's primary function is to provide a connection to an RS-485 network (using Campbell Scientific's LoggerNet or similar software, the operation of... (SDC or ME).
Introduction
The MD485 is transparent to a datalogger's CS I /O or RS-232).
Specifications
Size: 6.25 x 2.5 x .75 in the system is an intelligent RS-485 interface. MD485 RS-485 Multidrop Interface
1. It ...
MD485 RS-485 Multidrop Interface - Page 9
... Hyper Terminal TM or Procomm TM (always 9600 baud, 8-N-1) and pressing the "Setup" button on the RS-232 port, although CS I /O port while setting MD485 parameters on the MD485. MD485 RS-485 Multidrop Interface
3.1.3 Configuring the MD485
The MD485 is included with the message "Setup Timeout." NOTE
A datalogger can be downloaded at no charge from our web site...
MD485 RS-485 Multidrop Interface - Page 10
...and Santoprene jacket.
However, in this manual.)
The typical remote MD485 will be connected to supply 12 VDC power. You can cause an MD485 buffer overflow and create communication failures....datalogger) the MD485 can be set independently, so they can obtain power from that. One pair is set to the same baud rate.
3.2 Power Supplies
The typical base station MD485 connected directly ...
MD485 RS-485 Multidrop Interface - Page 13
.... FIGURE 5. For older products not listed, check for 12 V between CS I/O connector pin 8 and pin 2 (GND) or contact Campbell Scientific. The MD485 in PC400 or LoggerNet, transparent communications is a direct connect. PC400/LoggerNet/PC208W Set-up . Step 4 - If not using the EZSetup Wizard, simply add a datalogger to -Point LoggerNet Network Map
7
Point-to a COM...
MD485 RS-485 Multidrop Interface - Page 14
... Response Time" can be left at which the MD485 communicates by default. Step 5 - MD485 Point-to your datalogger using MD485s. MD485 RS-485 Multidrop Interface
b.
Connect
You are now possible.
5. System Configuration
The block diagram in Figure 6 depicts the connection of a computer to a network of Campbell Scientific dataloggers using PC400, LoggerNet, or PC208W Connect screen...
MD485 RS-485 Multidrop Interface - Page 15
... MD485) and is connected to one or more remote MD485s with the CABLE2TP cable. Functioning as
9 After this configuration, the MD485 acts as the active ports in the MD485 Setup Menu...set to be transmitted on the datalogger.
The MD485 at the computer is powered from the datalogger CS I/O port. When data needs to receive. When using the CS I/O interface on the RS-485 link, the driver...
MD485 RS-485 Multidrop Interface - Page 19
... in the P97 instruction of this, termination resistors...described in the datalogger manual.
8. The standard ...supports 32 devices (driver/receiver pairs) in the MD485 feature fail-safe circuitry, which is possible through MD485s in the LoggerNet Setup. MD485 RS-485 Multidrop Interface
7. Wiring Specifications
8.1 RS-485 Line Length
The EIA/TIA RS-485 communications standard, an upgrade...
MD485 RS-485 Multidrop Interface - Page 20
...and long cable runs, this is B&B's Model 485OP, which provides 2 kV isolation....spec says to earth ground with the ground symbol and the MD485 ...of the line. It rarely solves problems when used as possible.
•...at every node. In most installations.
• Connect the MD485's ground lug to use repeaters...MD485 RS-485 Multidrop Interface
The RS-485 specification also recommends connecting a ...
MD485 RS-485 Multidrop Interface - Page 23
... done with Transparent Communication or MD9 Emulation, but is used in place of a null modem (the COM220 and MD485 are both "modem" devices). INTERNAL (12V 7 AMP HOUR) BATTERY -
To RS-485 Network
FIGURE A-1. A Campbell Scientific Model COM220 Telephone Modem is not possible with Transparent Communication. Connection to the A100. Appendix A.
To Phone Line
A100...
MD485 RS-485 Multidrop Interface - Page 29
... be made in two different ways. 1) Using a Campbell Scientific PS100 Power Supply with A100
Figure B-1 shows an RF401 to the RF401 and the MD485. Connection to MD485 network using a datalogger in transparent mode or with transparent communication. The following configurations will describe how to set-up the RF401 to a single PakBus datalogger is not possible...
MD485 RS-485 Multidrop Interface - Page 37
... following configurations will describe how to set-up the MD485 to RF401 network using each communication mode. The connection between the remote MD485 and the base RF401 can be ...C-1 shows an MD485 to RF401 network using a PS100 with A100 Null Modem Adapter.
The following sections will provide communications in two different ways. 1) Using a Campbell Scientific PS100 Power Supply...
MD485 RS-485 Multidrop Interface - Page 61
... PakBus network c. this baud rate must match the MD485's baud rate All other end of the CABLE5CBL cable to CC640 Digital Camera
The MD485 is configured using DevConfig. Connect the other parameters may use the defaults (see CC640 manual for more information). CS I /O and RS-485 b.
PakBus Address -set to MD485 Connection
Hardware Requirements a. MD485 b. Appendix F.
MD485 RS-485 Multidrop Interface - Page 65
... connected to address synchronous devices; can be used as a PC serial port. H-1 It is Campbell Scientific's input/output port.
MD485 Port Pin Descriptions
CS I/O Port
The CS I/O port is not a standard RS-232 pin-...out. Appendix H. It is a partial implementation of the MD485, NC = No Connection
RS-232 Port
The "RS-232" port is configured as Data ...
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