Cables
GFK-0356Q Chapter 10 Cables 10-25
10
Expansion Port Pin Assignments
The following table lists the expansion port pin assignments you will need when building remote
cables. All connections between cables are point-to point, that is, pin 2 of one end to pin 2 of the
opposite end, pin 3 to pin 3, etc.
Table 10-2. Expansion Port Pin Assignments
Pin Number Signal Name Function
16 DIODT I/O Serial Data Positive
17 DIODT/ I/O Serial Data Negative
24 DIOCLK I/O Serial Clock Positive
25 DIOCLK/ I/O Serial Clock Negative
20 DRSEL Remote Select Positive
21 DRSEL/ Remote Select Negative
12 DRPERR Parity Error Positive
13 DRPERR/ Parity Error Negative
8 DRMRUN Remote Run Positive
9 DRMRUN/ Remote Run Negative
2 DFRAME Cycle Frame Positive
3 DFRAME/ Cycle Frame Negative
1 FGND Frame Ground for Cable Shield
7 0V Logic Ground
I/O Expansion Bus Termination
When two or more baseplates are cabled together in an expansion system, the I/O expansion bus
must be properly terminated. The I/O bus must be terminated at the last baseplate in an expansion
system. Each signal pair is terminated with 120 ohm, 1/4 watt resistors wired between the
appropriate pins, as follows (see the above table, also):
pins
16 – 17; 24 – 25; 20 – 21; 12 – 13; 8 – 9; 2 – 3
The I/O bus termination can be done one of the following ways:
■ By installing an I/O Bus Terminator Plug, catalog number IC693ACC307, on the last
expansion baseplate (local expansion baseplate or remote baseplate) in the system. The
Terminator Plug has a resistor pack physically mounted inside of a connector. The I/O Bus
Terminator Plug is shipped with each baseplate; only the last baseplate in the expansion chain
can have the I/O Bus Terminator Plug installed. Unused I/O Bus Terminator Plugs can be
discarded or saved as spares.
■ If an expansion system has only one expansion baseplate, the I/O bus can be terminated by
installing as the last cable, the 50 foot (15 meter) I/O Expansion cable, catalog number
IC693CBL302 or IC693CBL314. These cables have the termination resistors installed in the
end that connects to the expansion baseplate connector.
■ You can also build a custom cable with termination resistors wired to the appropriate pins for
installation at the end of the bus.
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