12
Counterpart Counting Scale Indicator
2.8
Cable Grounding
Except for the power cord, all cables should be grounded against the scale enclosure. Do the following to ground
shielded cables.
•
Use the lockwashers, clamps, and kep nuts provided in the parts kit to install grounding clamps on the
enclosure studs. Install grounding clamps that will be used; do not tighten nuts.
•
Route cables and grounding clamps to determine cable lengths required to reach cable connectors. Mark
cables to remove insulation and shield as described below.
•
For cables with foil shielding, strip insulation and foil from the cable half an inch (15 mm) past the
grounding clamp (see Figure 2-9). Fold the foil shield back on the cable where the cable passes through the
clamp. Ensure silver (conductive) side of foil is turned outward for contact with the grounding clamp.
•
For cables with braided shielding, strip cable insulation and braided shield from a point just past the
grounding clamp. Strip another half inch (15 mm) of insulation
only
to expose the braid where the cable
passes through the clamp (see Figure 2-9).
•
Finish installation using cable mounts and ties to secure cables inside of indicator enclosure.
Cord grip
Insulated cable
Foil
(silver side out)
Grounding clamp
Shield wire
(cut)
Length of foil before folding
back on cable insulation
Cut insulation here
for foil-shielded cables
Braid
Cut insulation here
for braided cables
NOTE: Install lockwashers
first, against enclosure,
under grounding clamp
Figure 2-9. Grounding Clamp Attachment for Foil-Shielded and Braided Cabling
2.8.1
Serial Communications
Wire the serial communications cables to J4, which is Port 2 (5-wire RS-232 port). J5 is Port 1 (RS-232 and 20
mA). Connect communications cables to J5 and J4 as shown in Table 2-3.
Use cable ties to secure serial cables to the inside of the enclosure.
Port 1 supports full duplex RS-232 communications only; Port 2 provides either active 20 mA output or duplex
RS-232 transmission. Both ports are configured using the SERIAL menu. See Section 3.7.3 on page 42.
Connector
Pin
Signal
Port
J4
1
+20 mA
2
2
Ground or
-20 mA
3
Tx
4
Rx
5
CTS
6
RTS
J5
1
Ground
1
2
Ground
3
Tx
4
Rx
5
DTR
6
RTS
Table 2-3. J4 and J5 Pin Assignments
Note
An additional port (Port 3) is available if needed through the installation of an option card at J14.
