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Is it possible to connect the CR800, CR850, CR1000, or CR3000 to a SCADA system through a Modbus RS-485 protocol?
Yes, using a MD485 modem.
How can a CR1000 be connected to a device that uses Modbus RTU over RS-485?
Several serial converters exist that serve this purpose. The recommended device to use is the MD485.
What is the best way to download data simultaneously from a remote CR1000 and CR3000 via a cell modem?
If both dataloggers are using the same cell modem, then simultaneous connection and download is not possible. To resolve this, first create a local network, such as by direct connection, RF4xx radios, an MD485, or Ethernet. Then use the cell modem to access the network.
How long can the cables be between networked dataloggers?
The maximum cable length depends on the interface being used. RS-232 connections will reach 15 m (50 ft). RS-485 connections go beyond 610 m (2,000 ft). IP connections can be routed worldwide.
Is using Ethernet the best option to connect a CR800 to a PC that is 500 to 700 feet away?
Since the maximum recommended length of CAT5 Internet cable is 330 ft from a hub or panel, a better option would be to use the MD485 modem. This modem uses a twisted pair cable for communication. Cable lengths can be as long as 4,000 ft.