Summary of Contents for Observator Instruments OMC-184
- Page 1 Signal Converter OMC-184 Users Manual Version no. 1.04 OBSERVATOR instruments B.V. P.O. Box 60 2980 AB Ridderkerk Rietdekkerstraat 6 2984 BM Ridderkerk Phone ++31 (0)1804 63411 Telefax ++31 (0)1804 63510...
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Page 2: Table Of Contents
3.3 Default settings OMC-184 ........ -
Page 3: General
OMC-184 Manual 1. General The OMC-184 Signal converter was developed to make an interface with digital sensors without the requirement to store sensor data. The data from the connected sensors is transmitted in one serial string or presented as analogue signals 0...10 volt or 4...20 mA. -
Page 4: Installation
2.3.1 Wind speed and direction OMC-160 The OMC-160 wind speed sensor is connected to the OMC-184 with a four core cable. Two cores for the power supply and two cores for the transport of the output signal. The power supply is controlled via a watch dog circuit. -
Page 5: Analogue Output Processor Board
2.4.2 Serial output format The OMC-184 can give information out on RS232, RS422 or currentloop levels. The protocols for the information sent out can be OMC-2900, NMEA or OMC-160 format. To protocol of the transmitted information can be selected with the command word INMO (INterface MOde). -
Page 6: Serial Output Cl
All input channels can be transmitted in this way every second to any receiving station. If the currentloop output signal from the OMC-160 is repeated by the OMC-184 the message looks as follows, <LF>D125<sp>V234<sp>cscs<CR>... -
Page 7: Rs232/Rs422 In/Output Channel
The RS232 channel is normally used to communicate with a computer to tell the OMC-184 which sensors are connected where and what the span and offset of the signal are. If necessary it is possible to change the software of the OMC-184 to accommodate different protocol s on customers request. - Page 8 RS232/RS422 in/output (E) and the Currentloop output (C), at the same time the transmission speed between the computer and the OMC-184 is changed. If the transmission speed is changed the transmission speed of the computer must be set to the same speed, otherwise communication is not possible.
- Page 9 CHSC The command CHSC (channel scaling) is used to set offset, range and resolution of an input channel. The internal value in the OMC-184 = (real value * range) + offset. For the analogue inputs the internal value = (real value /2.5 * range) + offset. The number of digits behind the decimal point is only important when the channel is also used for output to a serial port or display.
- Page 10 INMO The command INMO (interface mode) is used to select what output signal and format is used on the RS232/RS422 and the currentloop output of the OMC-184. A description of the forma t is given in paragraph 2.4. CSTY The command CSTY (checksum type) is used to select if the checksum over the messages...
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Page 11: Calibration Analogue Output Channels
Repeat the procedure for all analogue output channels. When the calibration is finished give the command SYCA 0, the OMC-184 will leave the calibration mode. Give the command SAVE to store all the calibration information in the EEprom. If this is forgotten the OMC-184 will loose all his calibration information when the OMC-184 is switched off. -
Page 12: Jumper Settings
Obsermet division OMC-184 Manual 4. Jumper settings 4.1 Jumper settings processor board The processor board has 12 jumper fields. Normally all jumpers are set correctly in the factory. 4.1.1 Jumper field J1 (between IC7 and IC5) The jumper field J1 is telling the micro processor in what mode the processor is working. There are three possibilities, 1. -
Page 13: Jumper Field J3
Obsermet division OMC-184 Manual 4.1.3 Jumper field J3 (between IC7 and C17) With the jumper field J3 it is possible to select a RS422 or RS485 output on the terminal X4 of the processor board. 4.1.4 Jumper field J4 (between IC8 and IC16) With the jumper field J4 it is possible to set the output swing of the analogue output channels B1 and B2.
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