Specifications

C•CURE apC/L Technical Manual
Using the Worksheet
B-3
Using the Worksheet
Use this worksheet to determine whether the readers in your layout fall within
the allowable wiring length range. To use the worksheet, you need to know
the type of wire used to connect the RMs or Input or Output modules to the
apC/L and the distances between each element of the chain.
To determine wiring length range:
1. Fill in the blanks in the figure with the wiring distances between the
apC/L and the first device and between each of the following devices. If
you estimate the distances, be sure to overestimate, rather than
underestimate. Use only the spaces corresponding to the RMs you have.
2. In the following table, find the wire resistance (ohms per foot) for the type
of wire you are using.
3. Write the resistance value from step 2 in each box of the Wire resistance
per foot column in the wire length worksheet shown in Table B.1.
4. On the worksheet, find the intersection of the Wire length (ft) column and
the row corresponding to the total number of devices in the chain. In that
box, enter the distance between the apC/L and the first reader. Check the
diagram in step one for the distances.
#feet
#3 Input
Module
# feet RM-4 #1 # feet RM-4 #2
apC/L RDR A
or RDR B
Wire Type Resistance (ohms per foot)
18 AWG 0.01277
22 AWG 0.03227
apcl.bk Page 3 Monday, May 15, 2000 3:21 PM