CR9000XCMeasurement and Control Datalogger

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1. CR9000X和CR9000XC之间有什么区别？

   的CR9000X and CR9000XC differ only in the number of I/O cards they can hold. The CR9000X can hold 9 I/O cards, and the CR9000XC can hold 5 I/O cards. We provide both sizes to accommodate our customers; the same I/O cards can be used in either chassis.

2. What needs to be done to get a CR3000 program to run on a CR9000 or CR9000X?

   The CR3000 program will have to be modified so that each measurement or control instruction includes the appropriate module number. Some parameters might differ as well.
3. How long can the cables be between networked data loggers?

   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.
4. Is there a way to only record measurements during the daytime and put the data logger in sleep mode during the nighttime to conserve power?

   Yes. The simplest method is to use conditional program statements that execute most of the code based on time. For example, the data could be scheduled to log at 6 a.m. and finish at 8 p.m. using CRBasic instructions such asTimeIntoInterval(). Another option is to use anIfThen/EndIfconstruction that does a logical test of light-level measurements based on a light sensor. An additional option is to use calculated sunrise and sunset times along with a combination ofRealTime()和Caseinstructions.

   For more information, see the “Decisions, Decisions, Decisions…” article.

5. If an RF modem is used to communicate with a data logger and a PC running LoggerNet, but the modem baud rate is one third of the data logger baud rate, is that a problem?

   If small amounts of data are transferred per transmission, it will not be a problem. Larger amounts of data can overrun buffers in the modem, causing lost data. In that situation, lower the baud rate on the data logger to avoid the issue.

6. What might cause a CRBasic data logger to stop storing data?

   Common causes include the following:

   • Loss of power to the data logger and the programRun On Power-up未设置属性（为此提供帮助see the “How Do You Run?” article.)
   • AFillStopCRBASIC程序中的指令用于设置数据表，以停止在完整时停止存储新数据
   • Logical conditions for writing to data tables that do not evaluate as TRUE

7. 数据记录器什么时候重置开关的12 V通道（SW12）？

   The data logger will not reset the SW12 unless it is done under program control using theSW12（）或者portset（）instructions, or unless the data logger compiles or recompiles a program. This could be done when a new program is sent to the data logger, or if the power is cycled.

8. Is it possible to have a data logger initiate the data transfer, rather than LoggerNet?

   可以对数据记录器进行编程以通过使用SendVariables()或者ModemCallback()instruction in CRBasic.

   注意：CR200X操作系统中不支持这些说明。

9. Should an SC32B be installed between the RS-232 port on a data logger and the port on a desktop PC to prevent ground loop issues?

   No, because it would not work. The SC32B is used to do the following:

   • Convert data logger logic levels (on the CS I/O port) to RS-232 levels
   • 光学地将数据记录仪与RS-232外围隔离
10. Is a wireless cellular phone transmitter available for Campbell Scientific data loggers?

    Yes. Both the RavenXTV (Verizon) and the RavenXTG (AT&T) are available.