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Related Manuals for Nokeval RCS770
Summary of Contents for Nokeval RCS770
- Page 1 User Manual 23.5.2006 V1.0 RCS770 USB / RS-485 / RS-232 converter...
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Page 2: Specifications
If RCS770 is connected to a computer via USB, it creates a virtual serial port that can be used just like an ordinary port. Every converter has an individual serial number, and the converter will retain the same COM port number even if plugged into a different USB port on the same computer. -
Page 3: Conversion Mode
CONVERSION MODE The conversion mode and other settings are done with jumpers. To access them, the enclosure has to be opened. Insert a small flat blade screwdriver between the lid and the bottom part of the enclosure left or right side and pull the lid off. - Page 4 USB – RS-485 4 3 2 1 4 3 2 1 3 2 1 Power supply RS-485 (optional) device D2 D3 Jumpers • To set in USB – RS-485 mode, set J10 and J12 according to the picture. • J1 and J5 define the 485 bus termination, see page 12. •...
- Page 5 USB – RS-422 RS-422 device Power supply (optional) 4 3 2 1 4 3 2 1 3 2 1 D2 D3 Jumpers • Set J10 and J12 according to the picture. • J1 and J5 define the 485 bus termination, see page 12. •...
- Page 6 USB – RS-232 4 3 2 1 4 3 2 1 3 2 1 D2 D3 RS-232 Jumpers • The USB–232 mode is selected with jumpers J9, J10, and J12 according to the picture. • J1, J5, J11, and J14 have no effect. Connections •...
- Page 7 RS-232 – RS-485 4 3 2 1 4 3 2 1 3 2 1 Mascot RS-485 device D2 D3 RS-232 Jumpers • To select 232–485 mode, set jumpers J9, J10, and J12 according to the picture. • J1 and J5 select the 485 bus terminations, see page 12. •...
- Page 8 RS-232 – RS-422 RS-422 device Jumpers • 232–422 mode is selected with jumpers J9, J10, and J12 according to the picture. • J1 and J5 define 422 bus termination, see page 14. • J14 controls power supply options, see page 10. •...
- Page 9 RS-485 REPEATER 4 3 2 1 4 3 2 1 3 2 1 RS-485 RS-485 device device D2 D3 Jumpers • 485 repeater mode is selected with jumpers J9, J10, and J12 according to the picture. • J1 and J5 define the 485 bus termination, see page 12. •...
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Page 10: Supply Voltage
Jumper J14 If jumper J14 is open, J7 is used to provide the supply voltage for RCS770 itself and J8 is used to provide the supply voltage for the RS-485 bus devices. If jumper J14 is closed, these two circuits are interconnected. You can bring the external power supply at either J7 or J8 and in both cases the same power supply will be used for both RCS770 and the bus devices. -
Page 11: Installing The Drivers
If you double click the port, you can change its properties. The most useful thing is the ability to change the port number (Port Settings, Advanced). USB hubs If RCS770 is connected to a USB hub, the hub should have a power supply of its own as always if any of the devices draw more than 100 mA current. - Page 12 Thus the communication is half-duplex. Connections RCS770 has four terminals for each RS-485 bus: D1, D0, Common, and +. The first three of these form the RS-485 bus and the fourth, optional line allows easy power supply wiring for the bus devices.
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Page 13: Direction Control
RS-485 bus. RS-232 When some data is sent to RCS770 via RS-232, RCS770 buffers it one byte duration. After that, it activates the RS-485 transmitters, waits another 1/2 bytes and then starts transmitting the data on the bus. When the last bit has been transmitted, the RS-485 transmitter is disabled to allow receiving data. - Page 14 In RS-422 bus, both wire pairs have always one transmitter enabled. There is no benefit in terminating or fail- safing the transmitting end of the wire pair. So it is recommended to enable the termination and fail-safes of the receiving end only: in RCS770, jumpers J1 should be set ”Not term” and J5 ”Term + FS”. Not term...
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Page 15: Handshake Lines
RS-232 PORT Pins The RS-232 port of RCS770 is of ”DTE” or ”data terminal equipment” type, similar to the port on PC's. So RS-232 devices can be connected to RCS770 with similar cable that would be used between the device and a PC. -
Page 16: Troubleshooting
If the voltage is 0, the bus is short-circuited or there are no fail-safes. Measure the voltage at each bus device and pay attention that the polarity is correct (D1 positive). Yrittajakatu 12 FIN-37100 Nokia Finland Tel +358 3 3424800 Fax +358 3 3422066 www.nokeval.com...