Omron NT20, User Manual

Page: 48 / 311

27
Connecting Link Adapters and RS-422A Converters Section 2-3
• Connect the shield wire at both ends of the cable carrying RS-422A/485
signals to ground, and ground the ground terminal on the Power Supply
Unit of the CPU or Expansion Rack to 100
Ω
max.
1. Taking care not to damage the shield, strip between 30 and 80 mm of
sheath off the end of the cable.
2. Carefully twist the shield mesh together to form a single wire, and carefully
cut off the material surrounding the signal wires and any unnecessary sig-
nal wires.
3. Strip the sheath off the signal wires to a length sufficient to attach crimp
terminals. Apply vinyl tape or heat–shrinking tube to the sheathes and
stripped parts of communications lines.
4. Attach stick-type crimp terminals to ends of the signal lines and crimp them
using a crimp tool.
• Recommend crimp terminals:
Phoenix Contact
AI Series
AI-0.5-8WH-B (serial number: 3201369)
• Recommended crimp tool:
Phoenix Contact ZA3
With four-wire cables, insert two signal lines into each crimp terminal together
before crimping.
• Recommend crimp terminals:
Phoenix Contact
AI Series
AI-TWIN2
×
0.5-8WH (serial number: 3200933)
• Recommended crimp tool:
Phoenix Contact
UD6 (serial number: 1204436)
5. Connect the signal lines and the shield line to the RS-422A/485 terminal
block.
30 to 80 mm