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Chell microDAQ Programming Manual

Pressure scanner acquisition system
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microDAQ
Pressure Scanner
Acquisition System
USER PROGRAMMING GUIDE
info@chell.co.uk
e-mail:-
Visit the Chell website at:
http://www.chell.co.uk
Chell Instruments Ltd
Folgate House
Folgate Road
North Walsham
Norfolk NR28 0AJ
ENGLAND
Tel:
01692 500555
Fax:
01692 500088
900167-1.3

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  • Page 1 Chell Instruments Ltd Folgate House Folgate Road North Walsham Norfolk NR28 0AJ ENGLAND Tel: 01692 500555 Fax: 01692 500088 microDAQ Pressure Scanner Acquisition System USER PROGRAMMING GUIDE info@chell.co.uk e-mail:- Visit the Chell website at: http://www.chell.co.uk 900167-1.3...
  • Page 2 Chell Document No. : 900167 Issue 1.3 ECO: 1270 Date: 28 November 2014 Chell’s policy of continuously updating and improving products means that this manual may contain minor differences in specification & functionality from the actual instrument supplied.

  • Page 3: Table Of Contents

    2.1 Command Packet............................2 2.2 Acknowledgement............................. 2 2.3 User Commands............................2 3. Status Data Format................. 6 4. microDAQ Communication Channels..........7 4.1 RS232 ............................... 7 4.1.1 Overview............................. 7 4.1.2 Connection ............................7 4.1.3 RS232 Protocol........................... 7 4.1.4 Control Via RS232 ..........................

  • Page 4: Introduction

    This document version supports V1.0.14 of the microDAQ firmware and V1.0.18 of the flightDAQ fimrware. If using earlier firmware then some user commands and/or parameters may be invalid. In this case please refer to an earlier version of this document – available on request, from Chell Instruments.

  • Page 5: User Command Protocol

    62, 37, 100, 67, 60 The parameter value is set at 100, so the parity byte is 62 ⊕ 37 ⊕ 100 ⊕ 60 = 67. The microDAQ should reply with "Test command rxd ok 100" 2.2 Acknowledgement.
  • Page 6 Rebuild C/67 None The calibration is rebuilt for the current temperature, using the Calibration active microDAQ settings Filter F/70 0 - Off Adjust the output filter setting that is applied after the calibration within the microDAQ. If switching the data delivery rate...
  • Page 7 3 - Internal RAM Get Status ?/63 0 : Short Return a status packet from the microDAQ. Three main versions 1 : With temp. are available, 'short', 'with temp.' and 'full'. Short returns status 2 : Full byte information showing current operating state only, whereas...
  • Page 8 CAN - see later) Internal RAM J/74 None Handshake command to indicate previous packet was received. Dump Must be sent after header packet & all subsequent data Handshake packets. Figure 2.2, The Available User Command Set for the microDAQ. Page 5...

  • Page 9: Status Data Format

    ASCII engineering units (ie degrees C). The 'full' status data contains the above, followed by fields for the setup options of the microDAQ. Each field is comma delimited, and its function is indicated in plain text between square parentheses.

  • Page 10: Microdaq Communication Channels

    Figure 4.1, Data Packet Protocol, RS232 Channel. 4.1.4 Control Via RS232 Incoming bytes on the microDAQ’s serial input are buffered, and if 5 successive bytes make up a command packet, the contents are decoded and an appropriate acknowledgement issued (‘*’ for positive, ‘!’...

  • Page 11: Tcp

    4.2 TCP 4.2.1 Overview. The microDAQ’s TCP channel affords it the ability to stream real time pressure data at high speed over standard 100Mbit Ethernet connections. 4.2.2 Connection. When using the TCP/IP channel, the microDAQ is programmed to listen on its local port number 101.

  • Page 12: Control Via Tcp

    1 in the registry key. Also note that the TCP channel of the microDAQ is subject to buffering both within the unit itself (the size of the buffer depending on number of channels and data rate), and within Windows ®...

  • Page 13: Can Protocol

    Two separate protocols are available from the setup – either multiple or single message. For the former, the microDAQ is allocated a fixed message for each group of 4 pressure channels, ie for a 64 channel scanner, 16 discrete CAN message identifiers are required. Alternatively for a more economical use of identifiers within a system, a single message id may be used, with all channels sent over this message sequentially.
  • Page 14 Message ID Data Byte 0x220 0x221 0x222 0x223 0x224 0x225 0x226 0x227 CH12 CH16 CH20 CH24 CH28 CH32 CH12 CH16 CH20 CH24 CH28 CH32 CH11 CH15 CH19 CH23 CH27 CH31 CH11 CH15 CH19 CH23 CH27 CH31 CH10 CH14 CH18 CH22 CH26 CH30 CH10...

  • Page 15: Can Data Rate

    20kHz (Gen1) or 50kHz (Gen2), requesting a data delivery of more than 20k/No. Channels or 50k/No. channels - ie 312Hz for a 64 channel Gen1 scanner - wastes resources and in some cases can cause the microDAQ to hang, requiring a power cycle. 4.3.5 Control Via CAN.

  • Page 16: Internal Ram Protocol

    – this is dependant on the number of channels being acquired (byte 3 in header above) and is irrelevant for CAN (always set to 1). After each packet is sent, the microDAQ waits for a handshake to confirm that the packet of data has been received at the host PC end. The dump...

  • Page 17: Valve Control User Commands

    The control of these valves is done via the same command protocol as with the other microDAQ commands (see previous sections above). For the microQDVP a separate comms connection has...

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