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Electrical connections
Grounding and shielding
RGH25F
IMPORTANT: The outer shield should be connected to the machine earth (Field Ground).
The inner shield should be connected to 0 V at customer electronics only. 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 0 V and earth,
which could cause electrical noise issues.
Recommended signal termination
REF interface digital outputs
Interface
A B Z Q E+
= 120 Ω
Cable Z
0
A B Z Q E-
Standard RS422A line receiver circuitry.
Capacitors recommended for improved noise immunity.
# Only required on alarm channel E for fail safe operation.
RGH25F RGS20 installation guide
Inner shield
REF interface
(except UHV)
0 V power
Outer shield
Pin 15
5 V
0 V
Customer
1k
#
220 pF
electronics
120 Ω
220 pF
1k
#
0 V
0 V
Extension cable
NOTE: Maximum cable length of 5 m between
RGH25F and REF interface
REF interface analogue outputs - REF0000 only
V
V
V
V
+
q
0
1
2
120 Ω
V
V
V
V
-
q
0
1
2
Customer
electronics
5 V
Output
signals
0 V
NOTE: Maximum extension cable length:
- analogue output (REF0000) - 100 m
- digital outputs, see table below
Recommended clock
Maximum cable
frequency (MHz)
length (m)
≥ 25
20
≤ 20
50
10
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