This product is no longer available. Some accessories, replacement parts, or services may still be available.
SDS122 Two-Way Serial Data Switch
Services Available
Repair Yes
Calibration Yes
Free Support Yes


Das SDS122 ist ein konfigurierbarer, serieller Zweiwege-Datenschalter, der es erlaubt, zwei Modems gleichzeitig an einem Logger anzuschließen. Der SDS122 verbindet den Logger mit dem Modem, das gerade Kommunikation initiiert hat, daher kann von zwei Stellen aus auf den Logger zugegriffen werden.

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Funktionen und Vorteile

  • Ein RS232-Port und ein CS I/O-Port
  • Unterstützt DTE und DCE Geräte
  • Arbeitet automatisch oder manuell


Technische Beschreibung

The SDS122 is a configurable, two-way serial data switch that allows two modem devices to be connected to a datalogger at the same time. The SDS122 connects the datalogger to whichever modem initiates communications allowing both remote and local interrogation of the datalogger to be carried out. The SDS122 supports both DTE and DCE devices without the need for a null modem cable, and can operate either in manual or automatic mode.

The SDS122 has one CS I/O port and one RS-232 port. The SDS122 answers the first incoming call; the other port receives a busy signal. Common combinations include a COM220 telephone modem and a RAD short haul modem or an SC32B Interface and a RAD short haul modem.

A typical application is to have a telephone modem connected to port B while a personal computer is connected to port A. This configuration allows either device to "talk to" the datalogger without the need to connect and disconnect cables at the datalogger. Some customers have also found this functionality useful when they wish to provide an easily accessible "walk-up" port for their computer while "burying" the telephone connection in the depths of an instrumentation enclosure.

Current Consumption in Various Modes/Communication Activity:

Mode Activity Current Drain from Datalogger
Isolated Quiescent (not communicating) < 75 µA
Isolated Communicating Up to 3 mA
Non-Isolated No RAD-SRM modem connected and with no communication activity (quiescent) < 100 µA
Non-Isolated RAD-SRM connected, waiting for call 2.5 mA
Non-Isolated RAD-SRM in communications session but no communication activity 9 mA
Non-Isolated Jumper PL50 not fitted; RAD-SRM connected but no communication activity. (This is the one-way, print-enabled RAD-SRM mode.) 100 µA


  • Weight: 181 g (6 oz)
  • Dimensions w/ Mounts:
    19.8 x 7.1 x 2.0 cm
    (7.8" x 2.8" x 0.8")
  • Operating Temperature:
    -25° to +50°C

Kompatibel mit

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Halterungen und Masten

Product Compatible Note

Additional Compatibility Information

Enclosure Considerations

The SDS122 requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. The SDS122's case has mounting flanges for attachment to the 1"-on-center hole grid of Campbell Scientific enclosures. Grommets and screws are provided to attach the flanges to the backplate of our enclosures.