Figure 2-15 and figure 2-16, Connect shield to ground at one end only – Honeywell UDC2500 User Manual
Page 43

Installation
4/07
UDC2500 Universal Digital Controller Product Manual
29
1 Do not run the communications lines in the same conduit as AC power.
D–
D+
COMMUNICATION MASTER
D+ (B) SHLD
D– (A)
120 OHMS
TO OTHER
COMMUNICATION
CONTROLLERS
D+
D–
120 OHMS ON LAST LEG
16 SHLD
17 D+ (B)
18 D– (A)
Connect shield
to ground at one
end only.
SHLD
2 Use shielded twisted pair cables (Belden 9271 Twinax or equivalent).
2
1
Figure 2-15 RS-422/485 Communications Option Connections
1 Do not run the communications lines in the same conduit as AC
power. Correct connections may require the use of an Ethernet
cross-over cable.
COMMUNIC
ATION MASTER
OR SWITCH
RXD+
SHLD
16 RXD-
17 TXD+
18 TXD-
14 SHLD
15 RXD+
RXD- TXD+
TXD-
1
2
Use Shielded twisted-pair, Category 5 (STP CAT5) Ethernet cable.
2
3
Use Switch rather than Hub to maximize performance.
3
1 Do not run the communications lines in the same conduit as AC
power. Correct connections may require the use of an Ethernet
cross-over cable.
COMMUNIC
ATION MASTER
OR SWITCH
TXD–
SHLD
16 RXD –
17 TXD +
18 TXD –
14 SHLD
15 RXD +
TXD+ RXD– RXD+
1
2
Use Shielded twisted-pair, Category 5 (STP CAT5) Ethernet cable.
2
3
Use Switch rather than Hub to maximize performance.
3
3
1 Do not run the communications lines in the same conduit as AC
power. Correct connections may require the use of an Ethernet
cross-over cable.
COMMUNIC
ATION MASTER
OR SWITCH
RXD+
SHLD
16 RXD-
17 TXD+
18 TXD-
14 SHLD
15 RXD+
RXD- TXD+
TXD-
1
2
Use Shielded twisted-pair, Category 5 (STP CAT5) Ethernet cable.
2
3
Use Switch rather than Hub to maximize performance.
3
3
1 Do not run the communications lines in the same conduit as AC
power. Correct connections may require the use of an Ethernet
cross-over cable.
COMMUNIC
ATION MASTER
OR SWITCH
TXD–
SHLD
16 RXD –
17 TXD +
18 TXD –
14 SHLD
15 RXD +
TXD+ RXD– RXD+
1
2
Use Shielded twisted-pair, Category 5 (STP CAT5) Ethernet cable.
2
3
Use Switch rather than Hub to maximize performance.
3
3
3
3
Figure 2-16 Ethernet Communications Option Connections
Figure 2-16 and Table 2-7 shows how to connect a UDC to a MDI Compliant Hub or
Switch utilizing a straight-through cable or for connecting a UDC to a PC utilizing a
crossover cable.