Watlow CPC400 - Manual (Page 58)

Chapter 2: Installation CPC400 Series User’s Guide
44 Watlow Anafaze Doc. 0600-2900-2000
Cable Recommendations
Watlow Anafaze recommends Belden 9843 cable or its
equivalent. This cable includes three 24 AWG (0.2 mm 2 ),
shielded twisted pairs. It should carry signals of up to
19200 baud with acceptable losses for up to 4000 feet (1220
m).
EIA/TIA-485 Network Connections
Watlow Anafaze recommends that you use a single daisy
chain configuration rather than spurs. Run a twisted-pair
cable from the host or converter to the first CPC400, and
from that point run a second cable to the next CPC400, and
so on. See Figure 2.33.
If necessary for servicing, instead of connecting each con-
troller directly to the next, install a terminal strip or con-
nector as close as possible to each CPC400, run a
communications cable from one terminal strip to the next
and connect the controllers to the bus with short lengths of
cable.
To avoid unacceptable interference, use less than 10 feet
(3 m) of cable from the terminal or connector to the CPC400
serial port.
Refer to Termination on page 45 for more on terminating
resistors.
Connect the shield drain to earth ground only at the com-
puter or host end.
Figure 2.33 Recommended System
Connections
Serial Port
232 Communications 485 Communications
Shielded Twisted Pair Cable
First CPC400 Second CPC400 Last CPC400
232-to-485
Converter