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MU-132, MU-133

The MU-132 and MU-133 modules are especially designed for the processing of quadrature signals from incremental rotary sensors (abbreviation IRC). However, the input signals encoder supports variety of other generally applicable counter modes.

The input circuits are designed for signals with RS-422 or TTL levels, and are equipped with digital low-pass filters to suppress "ringing" on input signals.

The encoder can be configured in-to following modes.

The output of the encoder is connected to the 32-bit counter (basic counting range 0÷4294967295) capable to unidirectional and bidirectional counting with configurable length (counting range from 0÷1 up to 0÷32767).

In case of a power-off, the counter value is backed up in EEPROM (does not require a backup battery limiting temperature range). After power-on the counter can optionally continue from either a backed up value or a zero value. Modules can therefore extend the IRC sensor function to the absolute encoder function.

Additionally, the MU-133 module is equipped with real-time clock circuit (abbreviation RTC) allowing e.g. to back up the power supply failure time. RTC circuit requires a battery and MU-133 can not be supplied for extended temperature range.


Type MU-132 MU-133
Number of inputs 3x RS-422/TTL (encoder/counter inputs)
1x TTL (auxiliary input)
Digital input signal -0,5÷5,5V
Overvoltage protection low capacitance TVS diodes
(max. 20A, 8/20µs)
Input impedance 8kΩ & 200pF approx.
Number of counters one bidirectional with configurable counting length
Counter inputs frequency 4MHz (modes without filter, phase frequency)
800kHz (modes with filter, phase frequency)
(signal asymmetry 40/60% max. for all modes)
Encoder modes quadrature (X1, X2, X4),
"up/down", "count/dir", "count/gate"
Counter range 0÷4294967295 (i.e. 232) or configurable
from 0÷1 up to 0÷32767
Counter value backup yes (EEPROM, battery-less)
Real-time clock (RTC) - - - yes
Supply voltage 10÷30VDC
Power consumption 1.6W max.
Housing & Dimensions Modulbox 3M
Signal terminals screw terminals, wire 2.5mm2 max.