Cable Specification; Rs-232 / Rs-422 / Rs-485 Cable; Electrical Feature; Appearance - AC&T System ETOS-XP Series User Manual

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
Item
Conductor resistance
Withstand voltage (DC)
Insulation Resistance
Capacitance
Characteristic Impedance
 Appearance
Item
No. of Core Wire
Specification
Conductor
Configuration
External Diameter
Thickness
Insulator
External Diameter
Unit
Ohm/km 59 or less
V/1min Resistant for 1min at 500V
MEGA Ohm-km 1,000 or more
pF/m 45 or less `
Ohm
Unit
Pair
AWG
NO./mm
Mm
Mm
Mm
- 16 -
Feature
Room temperature
Room temperature
120 (±12)
Single Wire Stranded Wire
2
22
1/0.64
0.64
0.55
1.64
Condition
In the air
1 KHz
10 MHz
2
22
7/0.254
0.76
0.55
1.76