Honeywell UDC2500 - 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.