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REF Installation drawing
Dimensions in mm
Electrical connections
Grounding and shielding
Inner shield
RGH25F
(except UHV)
Outer shield
Pin 15
NOTE: Maximum cable length of 5 m
between RGH25F and REF
NOTE: Maximum extension cable length:
- analogue output (REF0000) - 100 m
- digital outputs, see table below
Recommended clock frequency (MHz)
25
20
IMPORTANT: The outer shield should be connected to the machine earth (Field Ground). The inner shield
should be connected to 0V. Care should be taken to ensure that the inner and outer shields are insulated
from each other. If the inner and outer shields are connected together, this will cause a short between 0V
and earth, which could cause electrical noise issues.
Recommended signal termination
Digital outputs
Interface
A B Z Q E+
Cable Z
= 120R
0
A B Z Q E-
# Only required on alarm channel E for fail safe operation.
Standard RS422A line receiver circuitry.
REF interface
Extension cable
0 V power
NOTE: Inner shield must be
connected to 0V at
customer electronics only
Maximum cable length (m)
20
50
Analogue output,
5 V
REF0000 only
Customer
1k
#
electronics
V
V
V
q
0
120R
V
V
V
q
0
1k
#
0 V
Customer
electronics
5 V
Output
signals
0 V
V
+
1
2
120R
V
-
1
2
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