Serial Communication Considerations
The SmartReader Plus data logger must be powered correctly for proper communications and to maintain its internal battery life.
The logger receives power through the IC-101 interface cable when it is connected to the PC. The IC-101 powers the logger by asserting (placing a positive voltage on) the RS232 control lines RTS and DTR. To ensure that the logger is powered correctly when it is connected to a different device like a Ethernet to serial converter or a wireless modem, you must assert the equivalent control lines on the device you are using. The PC is considered a DTE (Data Terminal Equipment) device and uses RTS (Request To Send) and DTR (Data Terminal Ready) on pins 7 and 4 to power the logger.
If the device you are using is a DCE (Data Communication Equipment) then CTS (Clear To Send) and DSR (Data Set Ready) on pins 8 and 6 are control lines that must be asserted. If the device you are using is a DCE then a null modem adaptor must be used with the IC-101. (The RFA 100 cable is available for use instead of the IC-101 which eliminates the need for the null modem adaptor) The above pin numbers refer to a RS232 9-pin connector.
Consult the device manual or contact the manufacture of the device to determine whether the device is acting as a DTE or a DCE. DTE’s normally have a male connector whereas a DCE will normally have a female connector, but this is not always the case. Therefore, it best to consult the device documentation.
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