Overview of Changes

Release #148 of the VTi21 firmware bundle adds two exciting new monitoring capabilities.

Variant	New Version	Status
AC Sensor	148	New
Reed FDM Monitor	148	New
Aster	148	Unchanged*
FS2600	148	Unchanged*
Reed Relay	148	Unchanged*
UM71	148	Unchanged*
VT1	148	Unchanged*

*The variants which are not new in this release remain unchanged from version 109.

New Features

VTI21-ACS: Generic AC Sensor

The VTI21 can be employed as a two channel alternating current sensor for monitoring currents of up to 25A RMS. Typical applications include monitoring of AC track circuits and switch machines, however this versatile general purpose current sensor enables remote condition monitoring of any AC powered equipment.

See the AC Sensor documentation for more details.

VTI21-RFDM: Reed Frequency Division Multiplexer Monitoring

The well established Reed Track Circuit monitoring capabilities have been adapted to monitor Reed Frequency Division Multiplexing systems. The Reed FDM monitor supports a different set of frequencies than the Reed Track Circuit sensor:

Channel	Frequency
F04 F16 F17 F19 F20 F26 F27 F36 F38 F39 F47 F48 F83 F84 F92	803.25 Hz 702.50 Hz 697.50 Hz 687.00 Hz 682.50 Hz 611.75 Hz 607.75 Hz 505.00 Hz 493.50 Hz 488.00 Hz 419.75 Hz 410.25 Hz 446.00 Hz 533.75 Hz 842.00 Hz

The sensor reports the in-band current for these frequencies which can be used to infer the logical state of that "channel" and provide insight into the system's health.

See the full documentation for more details.

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