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RDP E725 Technical Manual

Microprocessor based digital indicator
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Download this manual See also: Technical Manual
RDP Customer Document
Technical Manual for the
E725 Serial Communication
Doc. Ref CD1423H
Issue H
This manual applies to units of mod status 7 ONWARDS
BS EN ISO 9001
Affirmed by Declaration
Certificate No. FM13141
of Conformity
USA & Canada
All other countries
RDP Electrosense Inc.
RDP Electronics Ltd
2216 Pottstown Pike
Grove Street, Heath Town,
Pottstown, PA 19465
Wolverhampton, WV10 0PY
U.S.A.
United Kingdom
Tel (610) 469-0850
Tel: +44 (0)1902 457512
Fax (610) 469-0852
Fax: +44 (0)1902 452000
E-mail sales@rdpelectrosense.com
E-mail: sales@rdpelectronics.com
www.rdpelectrosense.com
www.rdpelectronics.com

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Summary of Contents for RDP E725

  • Page 1 RDP Customer Document Technical Manual for the E725 Serial Communication Doc. Ref CD1423H Issue H This manual applies to units of mod status 7 ONWARDS BS EN ISO 9001 Affirmed by Declaration Certificate No. FM13141 of Conformity USA & Canada All other countries RDP Electrosense Inc.

  • Page 2: Table Of Contents

    INDEX INTRODUCTION.....................3 IDENTIFYING YOUR HARDWARE ................4 2.1 Decoding the E725 Part Number ................4 2.2 Decoding the Start-up Display Sequence ...............4 CONNECTION DETAILS ..................5 3.1 RS232 Connection Details ..................5 3.2 RS485 Connection Details ..................5 ESTABLISHING SERIAL COMMUNICATIONS ............7 4.1 IMPORTANT WARNING BEFORE SENDING COMMANDS........7 4.2 Serial Communications Protocol.

  • Page 3: Introduction

    1 INTRODUCTION The E725 is fitted with a serial port. This will be either RS232 or RS485 depending upon the options ordered. If it is RS232, one unit may be connected to each RS232 port on the host computer. For RS485, up to 256 unit may be connected via an RS232/485 converter to a single RS232 port on the host computer.

  • Page 4: Identifying Your Hardware

    RS232 output and no special options 2.2 Decoding the Start-up Display Sequence Connect the E725 to the correct supply and switch on. Note that the E725 identifies itself on start-up. Of particular importance are b, c and d. Note these values.

  • Page 5: Connection Details

    3 CONNECTION DETAILS If you do not wish to make up your own lead, please contact RDP sales and we shall be happy to quote. The connections depend upon whether the E725 is fitted with the optional RS485 protocol, or the standard RS232. Use sections 2.1 & 2.2 to establish if the unit is RS232 or RS485.
  • Page 6 The RS485 standard specifies that a maximum of 32 devices can be connected to a single driver. Therefore, if more than 32 E725's are to be connected to a network then it will be necessary to install RS485 repeaters at strategic points around the network. It may also be advantageous to use repeaters if the network is spread over a wide area.

  • Page 7: Establishing Serial Communications

    Configure the terminal software with the correct serial communications protocol and baud rate, as detailed in section 4.2. Type '#00 sys'* and press the enter key. The E725 should respond with a short line of identification text, including the unit part number and software version. If this happens, communication has been successfully established.
  • Page 8 XX = new module address 'OK' Baud rate changes do not take effect until the E725 has been reset. When all units have been re-programmed, turn them all off, then on. The new baud rate will now be set. Remember to change the baud rate of the host device before re-establishing...

  • Page 9: Serial Communication Commands

    In order to protect calibration parameters, several of communications commands require a password to be set before they will be accepted. The E725 has 3 levels of security; user level 1, 2 & 3. Some commands do not require a password. The password level for all commands is detailed by the command description.

  • Page 10: Details Of Runtime Commands

    Causes the error counter to be reset. #nn RESET Password not required This causes the E725 to reset, which is equivalent to switching the E725 off and on. This command will clear any change sent to E725 since the last SAVE command. #nn RESET PEAKS Password not required This causes the E725 to reset the MAX, MIN and TIR values.
  • Page 11 Only valid if dual channel option board is fitted or the customer has ordered the optional software function keys and it forces the E725 to display function 1 (i.e. input signal). If the dual channel board is fitted then the display, limits and analogue output will track channel A.

  • Page 12: Quick Reference Of Setup Commands

    Pascal etc) can be used to develop data acquisition and control software. Since the E725 can be used on a RS485 network, all units expect to be sent a two digit hexadecimal address before any command, this address must be preceded by # and the command line dos not match the programmed address of the E725 then the command will be ignored.

  • Page 13: Example Of A Setup Command

    It is important to remember that all instructions sent to the 650 must be terminated with a carriage-return line-feed sequence. The E725 can also be configured for software handshaking, so that the E725 will respond with either: - If a valid command that does not request data (e.g. ZERO) has been received.
  • Page 14 User level & password required ,L,P The E725 has 3 levels of security; user levels 1, 2 & 3. Each of the user levels has a separate password. In order to change settings, first check the user level required, then enter it here if you are authorised.
  • Page 15 User Level 3 ,Value This command is used to set the gain of the input board. Acceptable values are 1, 2, 3, 4, 5, 6, 7, or 8. See the E725 manual for details. #nn SET Counts, User Level 1...
  • Page 16 For example #00 SET USER LEVEL,1,1 #00 SET COUNTS,25 (i.e. Count = 25) #nn SET DP User Level 2 ,Resolution,Full Scale,Count This command is used to set the number of decimal places, the transducer calibration point (i.e. full scale value) and desired display resolution. Resolution Sets the Number of decimal places for display.

  • Page 17: Using The E725 With Windows Terminal

    #00 SYS and press the enter key. (Assuming the E725 address is 00) The E725 should respond, probably with its type and version number. This verifies that you have full communications with the E725. If not, check the settings, communication for the correct serial communications settings.
  • Page 18 Remember to save the terminal settings otherwise they will be lost.

  • Page 19: Faultfinding

    7.1 Communications problems. Check that the terminal emulation program on the host PC is configured to send both 'Carriage Return' and 'Line Feed' when the enter key is pressed. The E725 will not respond otherwise. Carriage return = ASCII code 13, sometimes entered as /013 or ^m...

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