Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Nokeval DCS771B
Summary of Contents for Nokeval DCS771B
- Page 1 User manual 25.7.2007 Hardware V1.1 DCS771B USB-to-RS-485 converter...
- Page 2 INTRODUCTION DCS771B is used to add an RS-485 connection in a PC computer. It is connected in a USB port, and the drivers create a virtual COM port that can be used just as an ordinary COM port. Even the baud rates and bit configuration can be changed in Windows port settings –...
- Page 3 Installing The USB interface chip needs two drivers: one for USB bus and the other to create a virtual serial port. The drivers can be obtained from a Nokeval Software CD or downloaded from the USB chip manufacturer: www.ftdichip.com (Drivers, FT232RL, VCP). The installation below assumes using CD, but using downloaded drivers is quite similar.
- Page 5 When USB bus driver ftdibus.inf is installed, Windows wants to install the virtual serial port driver, that makes the device to look like an ordinary COM port. Install in the same way as the bus driver. When all is complete, the OK indicator on the device should be lit. Finally it is necessary to find out, which COM port represents the device.
- Page 6 However the older Nokeval devices do not have a Common terminal available – in that case connect only D1 and D0. If the bus devices are to be powered via the DCS771B, the power is provided in the bus connector terminals 1+ and 2-. The DCS771B can obtain that power with various ways, see the next section.
- Page 7 The termination provided by DCS771B is an AC termination (there is a resistor 110 ohms and a capacitor 1 nF in series). It is enabled by closing the middle jumper on J7. It should be enabled, if DCS771B is the first or the last device on the bus.
- Page 8 Check if the OK LED is lit in the DCS771B. If not, reinstall the drivers. Step 2: Transmission Start your PC application and check that the Tx LED is blinking on the DCS771B. If not, there is something wrong with your application – a wrong COM port probably.
Need help?
Do you have a question about the DCS771B and is the answer not in the manual?
Questions and answers