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Wiring
12 Installation and Operations Manual
Digital I/O Wiring
Four digital I/O modules can be installed in the 8620 DET. Field wiring should be installed
directly onto the Digital I/O Rack as shown in Table 3-2 and Table 3-3.
Ethernet Wiring
The 8620 DET has two 100-Base-T Ethernet jacks. One is located on the side of the single board
computer. The second one is located on the communications terminal as shown in Figure 3-1.
These standard 8-pin RJ-45 connectors are used for ethernet wiring.
Communications Wiring
Table 3-4 describes the wiring considerations for each communications protocol.
Pin Pin Name
2I/O 1+
3 I/O 1-
4I/O 2+
5 I/O 2-
6I/O 3+
7 I/O 3-
8I/O 4+
9 I/O 4-
Table 3-2: Field Terminal
Pin Wire Color Terminal
1Red Standard Voltage
2 Black GND
7Orange I/O 1
4 Empty N/A
5Brown I/O 2
6 Empty N/A
7Blue I/O 3
8 Empty N/A
9Gray I/O 4
Table 3-3: Control Terminal — to Single Board Computer
Communication Protocol Description
Ethernet Maximum length of 250 feet of twisted pair CAT5 cable.
RS-232 Maximum length of 50 feet of cable.
RS-485/422 Maximum length of 4000 feet of cable.
Table 3-4: Communications Wiring Information