CR1000 Manual - Campbell Scientific

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Appendix C. Serial Port Pinouts as a connection to a computer DTE device. A standard DB9-to-DB9 cable can connect the computer DTE device to the CR1000 DCE device. The following table describes RS-232 pin function with standard DCE-naming notation. Note Pins 1, 4, 6, and 9 function differently than a standard DCE device. This is to accommodate a connection to a modem or other DCE device via a null modem. Table 124. CR1000 RS-232 Pin-Out PIN: pin number O: signal out of the CR1000 to a RS-232 device. I: signal into the CR1000 from a RS-232 device. X: signal has no connection (floating). PIN DCE Function Logger Function I/O Description 1 DCD DTR (tied to pin 6) O* Data terminal ready 2 TXD TXD O 3 RXD RXD I Asynchronous data transmit Asynchronous data receive 4 DTR N/A X* Not connected 5 GND GND GND Ground 6 DSR DTR O* Data terminal ready 7 CTS CTS I Clear to send 8 RTS RTS O Request to send 9 RI RI I* Ring *Different pin function compared to a standard DCE device. These pins will accommodate a connection to modem or other DCE devices via a null-modem cable. C.2.2 Power States The RS-232 port is powered under the following conditions: 1) when the setting RS232Power is set or 2) when the SerialOpen() for COMRS232 is used in the program. These conditions leave RS-232 on with no timeout. If SerialClose() is used after SerialOpen(), the port is powered down and left in a sleep mode waiting for characters to come in. Under normal operation, the port is powered down waiting for input. Upon receiving input there is a 40-second software timeout before shutting down. The 40-second timeout is generally circumvented when communicating with datalogger support software (p. 77) because it sends information as part of the protocol that lets the CR1000 know it can shut down the port. When in sleep mode, hardware is configured to detect activity and wake up. Sleep mode has the penalty of losing the first character of the incoming data stream. PakBus® takes this into consideration in the "ring packets" that are preceded with extra sync bytes at the start of the packet. SerialOpen() leaves the interface powered-up, so no incoming bytes are lost. When the logger has data to send via RS-232, if the data are not a response to a received packet, such as sending a beacon, then it will power up the interface, send the data, and return to sleep mode with no 40-second timeout. 550
Appendix C. Serial Port Pinouts Table 125. Standard Null-Modem Cable or Adapter-Pin Connections* DB9 DB9 pin 1 & 6 ---------- pin 4 pin 2 ---------- pin 3 pin 3 ---------- pin 2 pin 4 ---------- pin 1 & pin 6 pin 5 ---------- pin 5 pin 7 ---------- pin 8 pin 8 ---------- pin 7 pin 9 XXXXX pin 9 (most null modems have no connection) * If the null-modem cable does not connect pin 9 to pin 9, the modem will need to be configured to output a RING (or other characters previous to the DTR being asserted) on the modem's TX line to wake the datalogger and activate the DTR line or enable the modem. 551
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CR1000 Measurement and Control Syst
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Assistance Products may not be retu
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Table of Contents Section 5. System
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Table of Contents CRBasic Example 6
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Section 1. Introduction Italic —
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Section 2. Cautionary Statements 30
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Section 3. Initial Inspection 32
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Section 9. Maintenance 9.1 Moisture
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Section 10. Troubleshooting Table 1
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Section 11. Glossary watchdog timer
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Appendix A. CRBasic Programming Ins
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Page 499 and 500: Appendix A. CRBasic Programming Ins
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Page 553 and 554: Appendix D. ASCII / ANSI Table Amer
Page 555 and 556: Appendix D. ASCII / ANSI Table Dec
Page 557 and 558: Appendix E. FP2 Data Format FP2 dat
Page 559 and 560: Appendix F. Other Campbell Scientif
Page 573 and 574: Index 1 12V Terminal...............
Page 575 and 576: Index Communications Memory Errors
Page 577 and 578: Index Expression...................
Page 579 and 580: Index IP Information...............
Page 581 and 582: Index PanelTemp....................
Page 583 and 584: Index Runtime Errors...............
Page 585 and 586: Index TCDiff ......................
Page 588: Campbell Scientific Companies Campb
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CR1000 Manual - Campbell Scientific

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