Rohde & Schwarz M3SR Series 4100, Service Manual, Page: 73 / 138

Data Communication R&S M3SR Series 4100 HF Transceivers
2.3 6124.9007.82.01
2.3 Data Communication
The software-loadable modems provide for data communication in two modes:
¾ Fixed Frequency (direct FSK)
The data interface provides adjustable data rates in steps of 50, 75, 150, 300 and 600 Baud. The
data interface works in transparent mode.
¾ Optional R&S SECOM-H (2.4 kbit/s)
R&S SECOM-H supports data rates of 300, 600, 1200 and 2400 bit/s with FEC
2.4 Radio Built-in Test
The radio is fitted with a Built-in Test Equipment (BITE), performing various self-tests of different
depths. There are four different kinds of built-in tests implemented in the radio:
¾ Power-on Built-in Test (PBIT)
¾ Continuous Built-in Test (CBIT)
¾ Initiated Built-in Test (IBIT)
PBIT starts immediately and automatically when the radio is powered up, a CBIT continuously monitors
essential parameters during operation, and the IBIT is started by the operator. Each of these Built-in
Tests generates error messages for failure diagnosis and entries in the error log. The Built-in Tests also
covers external devices (e.g. accessories) such as power amplifiers.
The BIT results are made available to the operator in different ways:
¾ By indication on the display of a connected control unit (message box) immediately after the error
has been detected.
¾ By means of GO LED on the radio front panel and GO LED on a connected control unit which are
both switched off in case of a FAULT status of the radio.
¾ By means of an error list in the Control Unit menu 'Radio Error List'. The error list holding the last
256 events (start-ups, warnings and errors) with description and time of occurrence to be looked
up in menu 'Radio Error Details'.
For details on indications and starting of IBIT refer to the Operating Manual.