Honeywell UDC3500 - Table 2-8 Terminals for Connecting a UDC to a MDI Compliant Hub or Switch Utilizing a Cross-Over Cable

Installation
40 UDC3500 Universal Digital Controller Product Manual 3/07
Table 2-9 shows the connections for a UDC to a PC utilizing a straight-through cable
(wiring the UDC cable this way makes the necessary cross-over connections).
Table 2-8 Terminals for connecting a UDC to a MDI Compliant Hub or
Switch utilizing a cross-over cable
UDC Terminal UDC Signal Name RJ45 Socket Pin # Switch Signal Name
Position 4 Shield Shield Shield
Position 24 RXD- 6 TXD-
Position 25 RXD+ 3 TXD+
Position 26 TXD- 2 RXD-
Position 27 TXD+ 1 RXD+