IDTECK iTDC User Manual page 13
2~4 door access control system
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Also See for iTDC:
- Troubleshooting manual (94 pages) ,
- Quick installation manual (24 pages)
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iTDC
STP (Shielded Twisted Pair) is recommended when you connect RS485 or RS422
communication.
Connect shield wire of STP to power GND. But connect one end only.
If you connect both ends of shield wire to GND, communication error might be
occurred by current which is generated by mutual potential difference. Therefore,
you must connect only one end of shield wire to power GND.
p.6
NOTICE TO PREVENT TROUBLE AND MALFUNCTION
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