GPS16x-HVS.-PWGPS Receiver with Integrated Antenna for Prewired Enclosures

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1. 当GPSReady变量不是10时，数据记录器是否仍然与PPS信号同步？

   不可以。系统在使用信息输出以同步时钟之前需要稳定。当未使用PPS时，时钟操作正常进行，例如当没有连接GPS接收器时。

2. If the “gps_ready” output of the GPS() instruction is stuck at or near zero and the data logger clock is not being set, what might be the cause?

   The following are possible causes:

   • The GPS receiver is not producing the correct sentences.
   • The GPS receiver is configured with too low of a baud rate.
   • The GPS receiver is producing too many sentences for a given 1 s period.
   • The GPS receiver does not have a PPS (pulse per second) line correctly connected to the data logger.
   • The GPS receiver is a unit with a pulse-per-signal that is not 1 Hz.
3. If the “pps” field returned by the GPS() instruction usually displays “990000,” what might be the cause?

   Refer to the CRBasic Editor Help for theGPS()instruction. The system is working correctly. The data logger clock has been synchronized and is detecting a PPS line low to high transition within a 10 ms window before the start of the second.

4. How can latitude and longitude data from a GPS16X-HVS receiver be recorded on a data logger and then parsed out?

   To record the data, do the following:

   1. 从接收器中拉入一个或多个NMEA句子。
   2. Pull out longitude and latitude information from the received data.
   3. 将该数据存储在用户定义的数据表中。

   The easiest method for receiving and parsing out latitude and longitude information is to use theGPS()instruction.

5. How can four GPS16X-HVS receivers be connected to the COM ports of a data logger to read all four NMEA strings?

   This can be done, but only oneGPS()指令可以包括在程序中，因为不希望具有竞争时钟同步的多个输入。使用Serialopen（）和SerialInRecord()将数据从多个指令sensors, and use thesplitstr（）instruction to parse the data out.

6. 是否有GPS接口可用于保留与GPS时间同步的数据记录器？

   Campbell Scientific提供GPS16X-HV，以便与GPS时间同步。如果它们生成GPRMC和GPGGA句子，则可以使用其他GPS单元。如果单位具有PPS（每秒脉冲）输出，则可以提高时间同步精度。