Using the EF-Series Unit
2-24 Rev 2/01
2.5.7 Connecting Communications Wiring
The EF-Series unit communicates to external devices through its communication ports. Commu-
nications take place either through the operator interface port (LOI) or the host port (COM1). A
special 3-pin connector provides a port for an operator interface device. Wiring connections for the
host port are made using screw terminals on the installed communications card.
2.5.7.1 Operator Interface Port Wiring
Figure 2-8 displays the operator interface (LOI) port located at P10 on the Main Electronics Board.
The LOI port provides connections for a built-in EIA-232 communications interface to a configuration
and monitoring device. The configuration and monitoring device typically is an IBM-compatible
personal computer. A prefabricated operator interface cable is available as an accessory from Fisher.
The LOI port is intended for use with the ROCLINK Configuration Software. This LOI port is
compatible with RS-232 levels. The port signals originate on the Main Electronics Board terminations
and are wired to the three-terminal, cannon-style LOI connector located on the bottom of the
enclosure. An RTS terminal is provided on the Main Electronics Board (not routed to the cannon
connector) and is intended for future applications, such as using the LOI port as a second host port.
The following table shows the signal routing of the Main Electronics Board terminations and the
cannon-style connector:
Main Board Cannon Connector Signal
BLK 1 Common
WHT 2 RXD
RED 3 TXD
To Next Page
Loading...