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2.4.
Cable Specification
This section is the standard for the cables used for communication in ETOS-XP. If you do not
use the recommended cable (especially in long distance communication), be careful because
communication may become unstable or communication may be impossible.
2.4.1.
RS-232 / RS-422 / RS-485 Cable
When communicating using RS-422 or RS-485, twisted pair shield cable for RS-422 must be used
considering communication distance and communication speed. The following table lists the
recommended cable specifications.
Electrical Feature
Appearance
Item
Unit
Single Wire
Stranded Wire
Conductor
No. of Core Wire
Pair
2
2
Specification
AWG
22
22
Configuration
NO./mm
1/0.64
7/0.254
External Diameter
Mm
0.64
0.76
Insulator
Thickness
Mm
0.55
0.55
External Diameter
Mm
1.64
1.76
Item
Unit
Feature
Condition
Conductor resistance
Ohm/km
59 or less
Room temperature
Withstand voltage (DC)
V/1min
Resistant for 1min at 500V
In the air
Insulation Resistance
MEGA Ohm-km
1,000 or more
Room temperature
Capacitance
pF/m
45 or less `
1 KHz
Characteristic Impedance
Ohm
120 (±12)
10 MHz
