Campbell SC932C User Manual
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Campbell SC932C User Manual

9-pin to rs232-dce interface
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SC932C 9-Pin to
RS232-DCE Interface
User Guide
Issued 27.2.97
©
Copyright
1997 Campbell Scientific Ltd.

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Summary of Contents for Campbell SC932C

  • Page 1 SC932C 9-Pin to RS232-DCE Interface User Guide Issued 27.2.97 © Copyright 1997 Campbell Scientific Ltd.
  • Page 3 Note that goods sent air freight are subject to Customs clearance fees which Campbell Scientific will charge to customers. In many cases, these charges are greater than the cost of the repair. Campbell Scientific Ltd,...

  • Page 5: Table Of Contents

    Figures 1. SC932C Connected to RAD-SRM Short Haul Modem ........1 A-1 Minimum Connections for SC932C to 25-way DCE Interface ....A-1 A-2 Minimum Connections for SC932 to 9-way DCE Interface ......A-1 B-1 Connections for Using SC932C in ‘Printer’ Mode ........B-2 Tables C-1 25-Pin Male Connector Pin-out ..............

  • Page 7: Installation

    SC932C 9-Pin to RS232-DCE Interface The SC932C is used to interface a Campbell Scientific datalogger to modem devices that are configured with an RS232 DCE (Data Communications Equipment) serial port. The most common application is to allow the connection of a RAD-SRM short haul modem or third party telephone modem to a datalogger.

  • Page 8: Other Applications

    DTR status. 3. Other Applications The SC932C can be used in more specialist applications. Appendix B gives installation details where even lower power consumption may be possible, and also for applications where higher power outputs for the RS232 device are required.

  • Page 9: Appendix A. Sc932C To Rs232 Device Connection Details

    Appendix A. SC932C to RS232 Device Connection Details This Appendix gives details of the cables required for connection of an SC932C to DCE type RS232 devices, if the SC932C cannot be directly plugged into the 25-way DCE, RS232 socket. A.1 Cable for Connection to a 25-way DCE Interface A standard pin-to-pin cable is suitable.

  • Page 11: Appendix B. Technical Details Of Special Modes Of Operation

    >7V, by connecting pin 11 of the 25-way D connector to a voltage >3.5V DC. To do this, add a link between pins 11 and 4 (RTS) on the SC932C’s 25-way D connector. In this mode the SC932C consumes approximately 10-15mA continuously.

  • Page 12: Handshaking Lines

    B.2 Handshaking Lines In its normal power mode, and when inactive (i.e. the datalogger ME line is low) the SC932C only holds the RTS line high to provide a source of power to line- powered modems, such as the RAD modem.
  • Page 13 Campbell Scientific are aware of some modems which will re-trigger the ring line, despite this delay. The only consequence of this is that the datalogger will remain in communications mode for an extra 30 seconds after the end of the call;...

  • Page 15: Appendix C. Specifications

    Current consumption when driving other RS232 modems will vary with the number of lines connected and the input impedance of the inputs. With 3 inputs connected (DTR, RTS and Tx from the SC932C), of the minimum 3k Ω input impedance, and high communications activity the consumption may be up to 16mA.
  • Page 16 SC932C transmits data on this line SC932C receives data on this line Held active by SC932C Signal Ground If held >3.5V will force SC932C into high power mode Held high if ME is high (see Appendix B) Table C-2 9-Pin Male Connector Pin-out Pin No.

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