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C-4 Field Control™ Genius® Bus Interface Unit User’s Manual
–
October 1999 GFK-0825F
C
Selecting a Cable Type
The Genius bus is a shielded twisted-pair wire, daisy-chained from block to block and terminated at both ends.
Proper cable selection is critical to successful operation of the system.
Each bus in the system can be any cable type listed in the table below. Do not mix cables of different impedance,
regardless of cable run length. Do not mix cable types in long and/or noisy installations. Other, small-size twisted
pair shielded wire of unspecified impedance can be used for short runs of 50 feet or less, using 75 ohm terminations.
Selection of wire type may be limited by local and national codes and industry standards. Consult the cable
manufacturer to determine the cable's suitability for a particular type of installation.
Conservative wiring practices and national and local codes require physical separation between control circuits and
power distribution or motor power. Refer to sections 430 and 725 of the National Electric Code.
Cable #
& Make
NEC
(USA)
Type
Outer
Diameter
Terminating
Resistor*
-10%to+20%
1/2 Watt
Number of
Conductors/
AWG
Dielectric
Voltage
Rating
Ambient
Temp
Rating,
Deg. C
Maximum Length Cable Run,
feet/meters at baud rate
153.6s 153.6e 76.8 38.4 •
(A)9823
(C)4596
(M)M39240
none
CL2
CM
.350in
8.89mm
150 ohms 2 / #22 30V 60 2000ft
606m
3500ft
1061m
4500ft
1364m
7500ft
2283m
(B)89182 CL2P .322in
8.18mm
150 ohms 2 / #22 150V 200 2000ft
606m
3500ft
1061m
4500ft
1364m
7500ft
2283m
(B)9841
(M)M3993
CM
CL2
.270in
6.86mm
120 ohms 2 / #24 30V 80 1000ft
303m
1500ft
455m
2500ft
758m
3500ft
1061m
(A)9818C
(B)9207
(M)M4270
CL2
CM
CM
.330in
8.38mm
100 ohms 2 / #20 300V 80 1500ft
455m
2500ft
758m
3500ft
1061m
6000ft
1818m
(A)9109
(B)89207
(C)4798
(M)M44270
CL2P
CM
*
CMP
.282in
7.16mm
100 ohms 2 / #20 150V 200 1500ft
455m
2500ft
758m
3500ft
1061m
6000ft
1818m
(A)9818D
(B)9815
none
*
.330in
8.38mm
100 ohms 2 / #20 1500ft
455m
2500ft
758m
3500ft
1061m
6000ft
1818m
(O)911264
**
none .260in
6.60 mm
100 ohms 2 / #22 flexing 250V 80 1500ft
455m
2000ft
606m
3000ft9
09m
4500ft
1364m
(E)532185
BBDN
CM
approx .50in
(12.7mm)
100 ohms
4 pairs #24
(solid)
>150V 80
1500ft
455m
2000ft
606m
3000ft
909m
4500ft
1364m
(A)9818
(B)9855
(M)M4230
*
CM
CM
.315in
8.00mm
100 ohms 4 (two pair) #22 150V 60 1200ft
364m
1700ft
516m
3000ft
909m
4500ft
1364m
(A)9110
(B)89696
(B)89855
none
CMP
CMP
.274in
6.96mm
100 ohms 4 (two pair) #22 150V 200 1200ft
364m
1700ft
516m
3000ft
909m
4500ft
1364m
(A)9814C)
(B)9463
(M)M4154
none
CM
CL2
.243in
6.17mm
75 ohms 2 / #20 150V 60 800ft
242m
1500ft
455m
2500ft
758m
3500ft
1061m
(A)5902C
(B)9302
(M)M17002
none
CM
CM
.244in
6.20mm
75 ohms 4 (two pair) #22 300V 80 200ft
60m
500ft
152m
1200ft
333m
2500ft
758m
Notes: A = Alpha, B = Belden, C = Consolidated, E = Essex, M = Manhattan, O = Olflex
• = Limited to 16 taps at 38.4 Kbaud
* = not known
**= Suitable for applications requiring high flexibility, continuous flex or vibration.
NEC classes are based on data obtained from manufacturers and are subject to change. CANADIAN CEC codes are
generally similar. Other countries may vary. The serial bus can be treated as a Class 2 circuit when appropriate
wiring practices are followed. Maximum available bus lengths may be affected when installation requires the high
voltage rated CM (Communications) rating. CM types can replace CL2, but not vice versa.