IDTECK Star Finger007, Manual

Page: 28 / 103

Installation Tips & Check point p.21
1.2 Recommended Cable Type
Reference Description Cable Specification
① Finger007 Power (DC12V)
DC Power -> Finger007
Belden #9409, 18 AWG
2 conductor, unshielded
②*
1
Reader (Power and Data)
External Reader -> Finger007
Belden #9512, 22 AWG
4 conductor, shielded
Belden #9514, 22 AWG
8 conductor, shielded
③ Door Contact
Exit Button
Sensor Input
Input -> Finger007
Belden #9512, 22 AWG
4 conductor, shielded
Belden #9514, 22 AWG
8 conductor, shielded
④ Door Lock, Alarm Device
Lock (Alarm) -> Finger007
Belden #9409, 18AWG
2 conductor, unshielded
⑤ RS232 Cable
Converter -> PC
Belden #9829, 24 AWG
2 twisted pair, shielded
⑥ RS485 Cable
Finger007 -> Finger007
Finger007 -> Converter
Belden #9829, 24 AWG
2 twisted pair, shielded
RS422 Cable
Finger007 -> Finger007
Finger007 -> Converter
Belden #9830, 24 AWG
3wisted pair, shielded
2 Check Point during Installation
2.1 Termination Resistor
Termination Resistors are used to match impedance of the network to the impedance of the
transmission line being used. When impedance is mismatched, the transmitted signal is not
completely absorbed by the receiver and a portion of signal is reflected back into the transmi
ssion line.
The decision whether or not to use Termination Resistors should be based on the cable lengt
h and data rate used by the communication system.
1 Thicker wires are needed if you connect a reader with high current consumption.