Specifications

C•CURE apC/L Technical Manual
apC/L Physical Requirements
2-14
RS-485 Use RS-485 transmission to connect apC/L panels in a chain.
A multidrop line can have a total length of 4,000 ft. (1,219 m). Host
signals must be converted to an RS-485 by using an RS-232 to RS-485
converter.
In a multidrop configuration
1. Remove jumpers W4 and W5 on all apC/Ls except the last in the
chain.
2. Connect the apC/Ls using twisted, shielded 24 AWG (0.288 mm)
Belden #9842.
3. Tie the shield wires together where the two meet, but do not connect
the shield at the apC/L.
4. Ground the shield wires at the RS-232/RS-485 converter.
If your converter does not have an available point to connect the
shield to chassis ground, connect the shield at the chassis ground
connectiononthelast apC/L only.
RS-232C to RS-485 Converter
If you are using RS-485 transmission, you must use an RS-232C to RS-
485 converter to convert the chain to RS-485 at the host. Sensormatic
recommends using Black Box model #IC108A or an equivalent device.
Note For more information on Black Box devices, go to the Black Box
web site at http://www.blackbox.com.
apcl.bk Page 14 Monday, May 15, 2000 3:21 PM