Omega Products CIO-COM485 User Manual
D4-37
RS-485 COM1 or COM2
Interface for PCs
Model
CIO-COM485
$
129
⻬⻬
RS-485 Serial Interface
⻬⻬
COM1, COM2 or Any
Other COM address
⻬⻬
Software Enables TRx
and Rx
⻬⻬
Up to 56K Baud
⻬⻬
Access to IR Levels 2-7
The CIO-COM485 adds a single EIA compliant RS-485
port to your computer. RS-485 ports support longer
transmission lines than the more common RS-232 and
have the ability to switch between transmit and receive
signals at the connector.
The CIO-COM485 serial interface is designed around
the standard serial communications chip used in PC
serial I/O ports: COM1 and COM2.
RS-485 SETUP
The CIO-COM485 may be set up as COM1 or COM2
by choosing the appropriate base I/O address and
interrupt.
The register which controls transceiver enable/disable
is located at the board’s Base+7 address. Writing to
D0
RCVR XMTR XXXXXX
D0
0 0 Disabled Disabled
0 1 Disabled Enabled
1 0 Enabled Disabled
1 1 Enabled Enabled
D1 D2 D3 D4 D5 D6 D7
D1 Receiver Transmitter
Shown
actual size
Base+7 controls the
transmitters while reading from
the register reads the current
status.
DB9 CONNECTORS
The CIO-COM485 is equipped
with two DB9 connectors for
RS485 9 pin connectors and
cables.
In addition, in compliance with
RS-485, pins 5 & 9 are tied
together as are pins 4 and 8.
To Order
Model No. Price Description
CIO-COM485 $129 RS-485 interface card
Ordering Example: CIO-COM485 RS-232 is an interface card for
IBM PCs and compatibles, $ 129.
(Specify Model Number)
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