Signal types

Signal type RS422 (diff. input)

In differential mode the EL5101-00xx expects the signal levels after RS422. The data are transferred without ground reference as voltage difference between two cables (signal A and inverted signal /A). The terminal analyses differences greater than 200 mV as valid signals. The differential signal must be in the common mode range (<+13.2 V and >-10 V, with respect to GND) (cf. diagram). Signal levels outside this range can lead to destruction.

In differential mode only the voltage difference is evaluated, so that common-mode interference on the transmission link does not lead to corruption of the wanted signal, since any interference affects both cables simultaneously.

Signal type TTL (single ended)

If the EL5101 is only operated in single-ended mode, a nominal level voltage between 3.5 V and 5.5 V is expected.

The EL5101-0010 and EL5101-0011 do not support single-ended mode.

Open circuit detection

Open circuit detection (Index 0x80n0:0B, 0x80n0:0C, 0x80n0:0D) is activated:

• for EL5101-0010 and EL5101-0011, in the range -0.475 V > Vid > +0.475 V (typically),
• for EL5101 and EL5101-0090, in the range -1.5 V > Vid > +1.5 V (typically)

(subject to change).