Check Points During Installation - IDTECK ITDC ITDCSR EIO88 User Manual

IDTeck – iTDC 2~4 DOOR ACCESS CONTROLLER
4.1.2 RECOMMENDED CABLE TYPE AND PERMISSIBLE LENGTH OF CABLE
Reference
①
*
②
③
④
⑤
⑥
*:
Need thicker wire if you connect the reader with high current consumption.
4.2 CHECK POINT DURING INSTALLATION
4.2.1 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 transmission line.
The decision whether or not to use termination resistors should be based on the cable length and data rate
used by the communication system.
For example, if you use 9,600 baud rate and 1,200m length of cable, the propagation velocity of cable is
0.66 x speed of light (This value is specified by the cable manufacturer), if we assume the reflections will
damp out in three round trips up and down the cable length, the transmitted signal will stabilize 18.6us
101-001 (iTDC), 101-002 (EIO88), 101-145 (iTDCSR)
Description
iTDC Power (DC12V)
DC Power -> iTDC
Reader (Power and Data)
Extra Reader -> iTDC
Door Contact
Exit Button
Sensor Input
Input -> iTDC
Door Lock, Alarm Device
Lock (Alarm) -> iTDC
RS232 Cable
Converter -> Host P.C.
RS485 Cable
iTDC -> iTDC
iTDC -> Converter
RS422 Cable
iTDC -> iTDC
iTDC -> Converter
Cable Specification
Belden #9409, 18 AWG
2 conductor, unshielded
Belden #9512, 22 AWG
4 conductor, shielded
Belden #9514, 22 AWG
8 conductor, shielded
Belden #9512, 22 AWG
4 conductor, shielded
Belden #9514, 22 AWG
8 conductor, shielded
Belden #9409, 18AWG
2 conductor, unshielded
Belden #9829, 24 AWG
2-twisted pair, shielded
Belden #9829, 24 AWG
2-twisted pair, shielded
Belden #9830, 24 AWG
3-twisted pair, shielded
-15-
Maximum
Distance
30m
150m
300m
300m
15m
1,200m
Users Manual