R&S®SA129 Station Monitoring Unit

Monitoring of remote stations

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  • Panoramica

Key Facts

  • Extensive capabilities for supervising remote stations
  • Various monitoring sensors, e.g. for opening of windows or doors, temperature, relative humidity, smoke detection and power supply

Brief Description

The Station Monitoring Unit R&S®SA129 provides extensive capabilities for the supervision of remote stations.

Key Facts

  • Extensive capabilities for supervising remote stations
  • Various monitoring sensors, e.g. for opening of windows or doors, temperature, relative humidity, smoke detection and power supply
  • Reinitialization of a remote system
  • Tried and tested in various systems
  • Compact design
  • Cost-effective implementation

Brief Description

The Station Monitoring Unit R&S®SA129 provides extensive capabilities for the supervision of remote stations.

A station monitoring system consists of one R&S®SA129 (which functions as a status display and remote control console) in the control station and one R&S®SA129 per remote station.

The R&S®SA129 in the remote station scans the connected sensors and executes the remote control commands received from the R&S®SA129 in the control station. Various sensors are available for monitoring the opening of windows or doors, temperature, relative humidity, smoke detection and power supply, for example. If an R&S®SA129 detects a change in the status of one of the sensors, it sends a message to the R&S®SA129 in the control station, where the status is displayed on the LCD display. In addition, the status can be output on a printer and/or a visual and/or acoustic signal can be set.

Another application of the R&S®SA129 involves reinitializing a remote system by interrupting the power supply, the system process controller being shut down beforehand via a UPS to prevent data loss.

The Station Monitoring Unit R&S®SA129 comes in two versions:

  • R&S®SA129 for communication via dialed PSTN lines, and
  • R&S®SA129C and R&S®SA129R for communication via LAN

Note: For easier reading throughout this web site we refer to both models as R&S®SA129. Features unique for the R&S®SA129C/R are explicitly mentioned. Information regarding specific means of communication always refer to the corresponding model only.

The Station Monitoring Unit R&S®SA129 is available as a 19" rackmount unit or as a 19" desktop unit.

Status messages and RC commands are transmitted via dialled PSTN lines. The line should be dedicated to the R&S®SA129 only, so that this line is independent of other communication lines. Sequences of DTMF tones are used for information transfer between the R&S®SA129 units, as in the case of a telephone answering machine. This simple mode ensures secure operation even under poor line conditions.

In case of a power failure, an integrated battery ensures operation of the R&S®SA129 for up to 24 hours.

The Station Monitoring Unit R&S®SA129 has eight sensor inputs and six remote control outputs:

  • Six inputs are optocoupled but not DC-isolated (low active). The polarity of the inputs can be logically inverted by means of appropriate entries on the chipcard.
  • Two inputs can be set separately to the same operating mode by means of jumpers or used in complete potential isolation where the two inputs accept voltages from 4 V to 28 V DC. It is possible to define whether the dead or live state corresponds to the OK state.
  • The I2C bus control input can be used to connect one or more temperature sensors.
  • Three control outputs are open collector outputs (current sinks) with a maximum voltage of 40 V and a maximum current drain of 800 mA. They switch either the internal supply voltage of 12 V DC or an external voltage corresponding to their capacity.

The R&S®SA129 has two serial RS-232-C interfaces. The COM1 interface can be used to transfer the status signals to a superordinate system. The COM2 interface is used to read from and write to the chip card.

If the R&S®SA129 reinitializes the remote system by disconnecting the power, the UPS must be able to shut down the process controller before switching off the power. Therefore, the PC must be connected to a UPS via a serial interface. The PC will receive the message from the UPS. Afterwards the operating system shuts down all running applications and then itself.

When the R&S®SA129 is used as a control station, an EPSON-compatible printer can be connected to the LPT interface. The status messages received together with the time of day are logged by this printer. The interface is also used to update the device firmware.

The basic firmware of the R&S®SA129 is identical for each unit. Customer and system-specific information is defined and stored on a chipcard.

If the station monitoring unit is delivered as part of a complete monitoring system, the chip card will usually be programmed to the system-specific configuration by Rohde & Schwarz.

However, the configuration may also be programmed by the customer. A null modem cable connected to the R&S®SA129 as well as the R&S®SA129 CardEditor which runs under Windows XP, Windows 2000 or Windows NT4.0 are required to read from and write to the chipcard.

The following information is stored on the chipcard:

  • Type of application (control station or remote station)
  • Names of stations and their telephone numbers
  • Number of sensor inputs used
  • Number of remote control outputs used and their polarity (high or low active)
  • Language (ASCII)
  • Text to be output to the display
  • Limit values for temperature monitoring
  • Important parameters of national PSTN networks, which do not comply with standards
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