SI-700 –EIA-232/EIA-485 Interface
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SI-700 – EIA-232/EIA-485 INTERFACE
Part Number
SI-700 (EIA-232/EIA-485 Interface)
Description
This module converts the electrical characteristics of the communication signal from the EIA-232
specification to the EIA-485 specification. Due to the fundamental differences between the EIA-232
and the EIA-485, the first option EIA-232 is used in peer-to-peer applications) this module was
implemented to work automatically. No control signal is necessary to manage the bus contention on
the EIA-485 side. It is necessary to connect the transmission and reception lines on both sides to
make the interface work.
The converter circuit provides signal isolation to grant a safe connection between two systems. This
module was designed to use the DFI/LC platform. No power supply was embedded in the board. It
uses the +5Vdc lines from the IMB bus to energize the circuit.
Figure 1- SI-700 Interface EIA-232/EIA-485
