9
RGH22 RGS20 installation guide
Electrical connections
Grounding and shielding
*
Maximum extension cable length
RGH22A and B -100 m, RGH22D, X, Z, P, Q and R - 50 m, RGH22Y, S and H -20 m
RGH22
Customer
electronics
Extension cable
*
Inner shield
Outer shield
Output
signals
0 V
5 V
IMPORTANT:
The outer shield should be connected to the machine earth (Field Ground). The inner shield should be connected
to 0 V. 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
Digital outputs - RGH22D, X, Z, Y, H, P, Q, R and S
Analogue output - RGH22 A, B
V
0
V
1
V
2
+
V
0
V
1
V
2
-
120
Ω
Standard RS422A line receiver circuitry.
Capacitors recommended for improved noise immunity.
†
Only required on alarm channel E for fail safe operation.
Customer
electronics
120
Ω
A B Z E-
Cable Z
0
= 120
Ω
Readhead
A B Z E+
0 V
0 V
220 pF
220 pF
Limit output
5 V - 25 V
R
P Q V
p
V
q
Select R so that maximum current does not exceed 20 mA.
Alternatively, use a relay or opto-isolator.
1k
†
0 V
1k
†
