Omega Products CN7-485-USB-1 User Manual

Bulletin E-90-CN7-485

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YELLOW LED

GREEN LED

Series CN7-485-USB-1 Communication Signal Converter

Specifications - Installation and Operating Instructions

The Model CN7-485-USB-1 Communication Signal
Converter is a low cost device that converts half duplex

RS 485 serial communications signals into a signal that can
be read by any computer with a USB port. The integral USB
connector and RJ-45 connector reduces set up time by
eliminating extra wiring. The Model CN7-485-USB-1 is
powered via the USB connection which eliminates the need
for an external power source. The compact size is great for
field installation, control panels, and lab testing.

APPLICATION

SPECIFICATIONS
Power Requirements: No external power required.
Power Consumption: 0.4 W.
Isolated Voltage: 3000 VDC.
Input Impedance: 96 kΩ.
USB Connector: A-Type (plug).
RS-485 Connector: RJ-45.
Baud Rate: 75, 150, 300, 600, 1200, 2400, 4800, 9600,

19200, 38400, 57600, and 115200 bps.
Compatibility: Full compliance with USB V.2.0
specification.

WIRING INFORMATION

RJ-45 PIN

PIN Signal Name
1 Reserved
2 Reserved
3 Reserved
4 SG+ (Red)
5 SG- (Green)
6 Reserved
7 Reserved
8 Reserved

OMEGA ENGINEERING, INC.

One Omega Drive
PO Box 4047
Stamford, CT 06907
PH: 1 - 203 - 359 - 1660

The “SG+” connects to the “+” and the “SG-” connects to the “-”
of the RS-485 Device.

LED MODES

1. Green LED indicates unit is powered.

2. Yellow LED to indicate that data is being transferred.

USB DRIVER INSTALLATION

NOTE: Do NOT connect CN7-485-USB-1 to PC before
extracting the driver file.

1. Insert the factory supplied CD into the CD drive of
your computer. If the CD does not start automatically,
click “Start”, “Run” & type
D:/CN7-485-USB-1_Drivers.exe then click “OK”.

2. Follow the on screen instructions to prepare for
installation of the driver.

3. A folder marked SiLabs should now appear in the
PC’s C drive.

4. Connect the CN7-485-USB-1 to PC.

5. The PC should automatically recognize that new
hardware has been found. If not, add hardware can
be found un the control panel.

6. Follow on screen instructions for assigning USB driver
to the CN7-485-USB-1.

7. Repeat steps 5 and 6 for assigning RS-485 Driver to
the CN7-485-USB-1.

8. Open the system folder in the control panel.

9. Click on hardware tab.

10. Open the device manager.

11. Double click on ports.

12. Verify that USB to UART Bridge Controller appears.

13. The Driver installation is complete.

MAINTENANCE

Upon final installation of the Model CN7-485-USB-1 USB to
RS-485 Converter, no routine maintenance is required. A
periodic check of system calibration is recommended. The
Model CN7-485-USB-1 is not field serviceable and should
be returned if repair is needed (field repair should not be
attempted and may void warranty). Be sure to include a
brief description of the problem plus any relevant
application notes. Contact customer service to receive a
return goods authorization number before shipping.

Copyright 2008 Omega Engineering, Inc. M - 4645 FR# R5-443583-90

OMEGA ENGINEERING, INC.

One Omega Drive
PO Box 4047
Stamford, CT 06907
PH: 1 - 203 - 359 - 1660