Datasheet

Si251_01c_oi_e.doc / Nov-15 Page 10 / 17
When the reference signals REF+ and REF- are not used or not available, the related inputs of
the converter must be tied to a defined potential.
When connecting the REF- pin to Vm with the REF+ pin open, the unit will generate a Z impulse
with every sine period.
When connecting the REF+ pin to Vm with the REF- pin open, the unit will not generate a Z
impulse.
The sine-cosine signals on the input site are highly sensitive analogue
signals! Therefore it is mandatory to use proper screening. Use of cables
with pair wise twisted leads is highly recommended. The cable length
should not exceed 5 meters if possible.
With critical applications, a terminating impedance (approx. 470 ohms,
and where required a capacitor of 680 pF to 4.7 nF) connected between
the differential inputs may be helpful.
5.2. RS 422 impulse output
B/AA
GND
/ZZ/B
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