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B&B Electronics MESR9xx manuel d'utilisation

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Table des matières du manuel d’utilisation

  • Page 1

    Manual Documentation Nu mb er MESR9xx-4508m www.bb-elec.com www.bb-europe.com V V l l i i n n x x M M E E S S R R 9 9 x x x x M M o o d d b b u u s s G G a a t t e e w w a a y y s s[...]

  • Page 2

    Manual Documentation Nu mb er MESR9xx-4508m www.bb-elec.com www.bb-europe.com V V l l i i n n x x M M E E S S R R 9 9 x x x x D D o o c c u u m m e e n n t t a a t t i i o o n n N N u u m m b b e e r r : : M M E E S S R R 9 9 x x x x - - 4 4 5 5 0 0 8 8 m m T T h h i i s s p p r r o o d d u u c c t t w w a a s s d d e e s s i i g g n n e e d d a a [...]

  • Page 3

    Table of Contents Page i Manual Documentation Nu mb er MESR9xx-4508m www.bb-elec.com/ www.bb-europe.com/ T T a a b b l l e e o o f f C C o o n n t t e e n n t t s s 1. Introduction .................................................................................................................. ..................................... 1 About MESR9xx [...]

  • Page 4

    Table of Contents Page ii Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ Modbus RTU Message ............................................................................................................ ................................................ 25 Modbus Serial Control ...........................................[...]

  • Page 5

    1. Introduction Vlinx MESR9xx Modbus Gateway Page 1 Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ 1 1 . . I I n n t t r r o o d d u u c c t t i i o o n n Thank you for purchasing a MESR9xx Modbus Gateway product! This product has been manufactured to the highest standard s of quality and performance to ensure your c[...]

  • Page 6

    1. Introduction Vlinx MESR9xx Modbus Gateway Page 2 Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ MESR9xx M odbus Gateway Model Numbering MESR9xx Modbus Gateway s are a growing family of prod ucts. Models are available with one or two serial connections . Network connecti on options include 10BaseT/100BaseTX copper [...]

  • Page 7

    1. Introduction Vlinx MESR9xx Modbus Gateway Page 3 Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ List of MESR9xx Modbus Gateway Models The following table lists the various ME SR9xx Modbus Gateway models available. Model Number Features MESR922T 2 RJ45 Copper, 2 port MEI with TB MESR922T-MT 1 Multi-mode ST, 1 RJ45 [...]

  • Page 8

    1. Introduction Vlinx MESR9xx Modbus Gateway Page 4 Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ Model Number Features MESR902T-S C40 1 Si ngle-mode 40 Km SC, 2 port MEI with TB MESR902T-S T80 1 Si ngle-mode 80 Km ST, 2 port MEI wi th TB MESR902T-S C80 1 Si ngle-mode 80 Km SC, 2 port MEI with TB MESR901 1 RJ45 Copp[...]

  • Page 9

    1. Introduction Vlinx MESR9xx Modbus Gateway Page 5 Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ • 10/100 Mbps Ethernet with Auto Selection, Auto MDI/MDIX • LAN and WAN Co mmunications • TCP Client or Server op eration - configurable • Firmware Upload for future revisions/upgrades • Software Support - Win[...]

  • Page 10

    2 . H a r d w a r e Vlinx MESR9xx Modbus Gateway Page 6 Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ 2 2 . . M M E E S S R R 9 9 x x x x M M o o d d b b u u s s G G a a t t e e w w a a y y H H a a r r d d w w a a r r e e MESR9xx Modbus Gateways are en closed in DIN rail mountab le enclosures and feature LED indicat[...]

  • Page 11

    2 . H a r d w a r e Vlinx MESR9xx Modbus Gateway Page 7 Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ LED Indicators MESR9xx Modbus Gateways have th ree types of LED indicators: Ethernet Link LEDs , a Ready LED and Serial Port LEDs . Figure 3. Ready Ethernet Port LEDs on 1 and 2 Ethernet Po rt Modbus Gateways E1/E2 [...]

  • Page 12

    2 . H a r d w a r e Vlinx MESR9xx Modbus Gateway Page 8 Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ Mode Switch A recessed momentary reset switch is located on the top of the enclosure. To activate the switch, insert a small plastic tool through th e hole in the enclosure and press lightly. Figure 5. Mode Switch T[...]

  • Page 13

    2 . H a r d w a r e Vlinx MESR9xx Modbus Gateway Page 9 Manual Documentation Number MESR 9xx-4508m www.bb-elec.com/ www.bb-europe.com/ Fiberoptic Connectors Modbus gateway models using fiber optic ne twork connections use either SC or ST connectors, depending on the specific model. Figure 7. SC and ST Fiberoptic Cable Connectors Serial Port Connect[...]

  • Page 14

    2 . H a r d w a r e Vlinx MESR9xx Modbus Gateway Page 10 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Figure 9. Five-Position Pluggable Terminal Block Note: Refer to Appendix D for connection pin-outs. Power Connector The power connector is a 2-posit ion pluggable terminal block. Figure 10. Power Connection Mountin[...]

  • Page 15

    2 . H a r d w a r e Vlinx MESR9xx Modbus Gateway Page 11 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Figure 11. DIN Clips on Modbus Gateway Modules. Large DIN clips are used on MESR92x, small DIN clips on MESR90x.[...]

  • Page 16

    3. Setup and Connections Vlinx MESR9xx Modbus Gateway Page 12 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 3 3 . . M M o o d d b b u u s s G G a a t t e e w w a a y y S S e e t t u u p p a a n n d d C C o o n n n n e e c c t t i i o o n n s s This section describes how to setup and connect MESR9xx Modbus Gateways. [...]

  • Page 17

    3. Setup and Connections Vlinx MESR9xx Modbus Gateway Page 13 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ RS-232 connections support eight signal line s plus Signal Ground. Signals are single ended and referenced to Ground. Default comm unications param eters are 9600, 8, N, 1 and no flow control implemented. RS-4[...]

  • Page 18

    3. Setup and Connections Vlinx MESR9xx Modbus Gateway Page 14 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Figure 13. MESR901 Connections Connecting the MESR9x2T -x The MESR9x2T-x has two serial connections th at support RS-232, RS-422 and RS-485 (2- and 4-wire). The unit has two connectors, both of which are 5-pos[...]

  • Page 19

    3. Setup and Connections Vlinx MESR9xx Modbus Gateway Page 15 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Note: Refer to Appendix D for connector pinout information. Figure 15. MESR902D-x Connections Connecting MESR9xx Modbus Gateways to a Network Network Connection (10BaseT/100BaseTX) When connecting a Modbus gat[...]

  • Page 20

    3. Setup and Connections Vlinx MESR9xx Modbus Gateway Page 16 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Configuring the MESR9xx Modbus Ga teway via the Network Connection When configuring via the network, either V linx Manager software or the web interface can be used. Configuring with Vlinx Manager MESR9xx Modb[...]

  • Page 21

    3. Setup and Connections Vlinx MESR9xx Modbus Gateway Page 17 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ To open the web configuration interface: 1. On a PC connected to the network, open a browser. 2. In the browser’s address bar, type th e IP address of the Modbus gateway. Note: Your Modbus gateway comes from[...]

  • Page 22

    3. Setup and Connections Vlinx MESR9xx Modbus Gateway Page 18 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Figure 18. Console Mode Setup To configure the Modbus gateway it must be put into Console Mode, using the Mode switch. To enter Console Mode, press and hold the Mode switc h for between two and ten seconds. Th[...]

  • Page 23

    3. Setup and Connections Vlinx MESR9xx Modbus Gateway Page 19 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Modbus gateway is configured as a TCP se rver. The socket program running on the PC establishes a communication c onnection with the Modbus gateway. Th e data is sent directly to and from the se rial port on t[...]

  • Page 24

    3. Setup and Connections Vlinx MESR9xx Modbus Gateway Page 20 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Reloading Factory Defaults To reload Factory Defaults, press and hold the Mode swit ch for more than 10 seconds. The LED indicators respond as follows: 1. The Ready LED blinks three times per s econd while the[...]

  • Page 25

    4. Properties Vlinx MESR9xx Modbus Gateway Page 21 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 4 4 . . D D e e s s c c r r i i p p t t i i o o n n , , M M o o d d b b u u s s G G a a t t e e w w a a y y P P r r o o p p e e r r t t i i e e s s The following MESR9xx Modbus Gateway properties are ordered alphabe tica[...]

  • Page 26

    4. Properties Vlinx MESR9xx Modbus Gateway Page 22 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Data/Parity/Stop The number of Data bits, type of Parity and num ber of Stop bits selected define the serial port parameters at which the Modbus gateway will operate. These param eters must be configured to match the par[...]

  • Page 27

    4. Properties Vlinx MESR9xx Modbus Gateway Page 23 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ If a DHCP server is not found on the network, th e Modbus gateway automatically configures to an IP address in the range of 169.254.0.0 through 169.254.255.255 and a subnet mask of 255.255.0.0 MESR9xx Modbus gateways com[...]

  • Page 28

    4. Properties Vlinx MESR9xx Modbus Gateway Page 24 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ MESR9xxModbus gateways come from the factor y with a default static IP address of 192.168.0.1, but will be reconfigured automa tically via DHCP as appropriate. If you need to change the stat ic IP address and do not know[...]

  • Page 29

    4. Properties Vlinx MESR9xx Modbus Gateway Page 25 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Modbus ASCII The Modbus ASCII message protocol is a human readable version of the Modbus message, and is one of the three Modbus formats supported by the MESR9xx Modbus Gateway. A major advantage of Modbus AS CII is it a[...]

  • Page 30

    4. Properties Vlinx MESR9xx Modbus Gateway Page 26 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Character Timeout The character timeout is the m aximum time th e gateway allows betw een characters from the slave device, used only in RTU mode. The default is 10ms. CRC/LRC Error Check The CRC/LRC check calculates the[...]

  • Page 31

    4. Properties Vlinx MESR9xx Modbus Gateway Page 27 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Password When you first receive the MESR9xx M odbus gateway from the factory the Password is blank so that you can initially access the M odbus gateway without entering a value into this field. To ensure security you sho[...]

  • Page 32

    4. Properties Vlinx MESR9xx Modbus Gateway Page 28 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ • RS-485 4-wire - Similar speed and distan ce specifications as RS-422 but allows multi-drop and full duplex connections. Typical ly uses two shielded twisted pairs and screw terminals but DB-9 connector s are also use[...]

  • Page 33

    4. Properties Vlinx MESR9xx Modbus Gateway Page 29 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ • For a Class D network (IP addresses 224.0.0.0 through 239.255.255.255) and Class E Networks (IP addresses 240.0.0.0 through 255.255.255.255) the subnet mask is ignored. • MESR9xxModbus Gateways come from the factor[...]

  • Page 34

    5. Upgrading Firmware Vlinx MESR9xx Modbus Gateway Page 30 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 5 5 . . U U p p g g r r a a d d i i n n g g t t h h e e M M o o d d b b u u s s G G a a t t e e w w a a y y F F i i r r m m w w a a r r e e Occasionally, updated firmware may become availab le for your Modbus gat[...]

  • Page 35

    5. Upgrading Firmware Vlinx MESR9xx Modbus Gateway Page 31 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ The current firmware version of the select ed Modbus gateway is shown in the text below the Modbus gateway name. Information about the selected firmware file is shown in the third text box. Downloading Firmware F[...]

  • Page 36

    5. Upgrading Firmware Vlinx MESR9xx Modbus Gateway Page 32 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 6. When the upgrade process is complete, click Close .[...]

  • Page 37

    6. Diagnostics Vlinx MESR9xx Modbus Gateway Page 33 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 6 6 . . D D i i a a g g n n o o s s t t i i c c s s Clicking the Diagnostics icon opens the Diagnostics dialog box and enables you to check the operation of connected Modbus gateways on the local computer. The Computer [...]

  • Page 38

    6. Diagnostics Vlinx MESR9xx Modbus Gateway Page 34 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 2. In the drop down box select the specifi c Modbus gateway you want to check. 3. Click the Start button Information about the progress of the pinging process is displayed in the Te st Progress box. Figure 22. Testing a[...]

  • Page 39

    7. Application Examples Vlinx MESR9xx Modbus Gateway Page 35 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 7 7 . . A A p p p p l l i i c c a a t t i i o o n n E E x x a a m m p p l l e e s s Modbus gateways can be used to integrate Modbus ne tworks in a wide va riety of settings. But as each setting has its own requ[...]

  • Page 40

    7. Application Examples Vlinx MESR9xx Modbus Gateway Page 36 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ From Serial Masters To Ethe rnet Master, Slave IDs Fixed Legacy Modbus slaves may have fixed IDs. To integrate these into a Modbus TCP network, a multiport MESR model (List here) can assign virtual slave IDs. F[...]

  • Page 41

    7. Application Examples Vlinx MESR9xx Modbus Gateway Page 37 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Figure 27. Time Critical Control, Direct and Remotely Monitored Modbus RTU, ASCII, and TCP Integration The range of potential devices and configurat ions of Modbus seri al networks is huge. While simple serial [...]

  • Page 42

    8. Modbus Help Vlinx MESR9xx Modbus Gateway Page 38 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 8 8 . . M M o o d d b b u u s s H H e e l l p p Modbus ASCII/RTU Basics The Modbus protocol emerged in the mid-1970s as an early protocol for linking terminals with Modicon PLCs using a master/slave (som etimes called a[...]

  • Page 43

    8. Modbus Help Vlinx MESR9xx Modbus Gateway Page 39 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Hints and Tips A few simple suggestions that may assist you if your system is experiencing problems include: • Slowing down the polling rate may be he lpful if power cycling doesn’t cure the problem. • A common mi[...]

  • Page 44

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 40 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 9 9 . . A A p p p p e e n n d d i i c c e e s s This section includes the following Appendices: • Appendix A: Default Gateway Settings • Appendix B: Product Specifications • Appendix C: Dimensional Diagrams • App[...]

  • Page 45

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 41 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Appendix A: Default Gateway Settings Setting Default Value Gateway Name TBD Password password field is blank from factory DHCP Enabled IP Address Default 192.168.0.1, DHCP will reconfigure as necessary Net Mask 255.255.2[...]

  • Page 46

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 42 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Appendix B: Product Specifications This section includes the following specifications : • General Specifications • Controls, Indicators and Connector Specifications • Serial Interface Specifications • Network Spe[...]

  • Page 47

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 43 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ General Specifications Hardware and included accessories Device MESR901-x, MESR902D-x or MESR902T-x Modbus gateway module CD CD with Vlinx Manager software for Windows 2000, 2003 Server/XP/Vista x32 Optional Accessories [...]

  • Page 48

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 44 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Controls, Indicators and Connector S pe cificati ons Switches Reset button Hold in for 0 to 2 seconds for hardware reset Hold in for 2 to 10 seconds for Console Mode (Do a hardware reset or recycle power to exit Console [...]

  • Page 49

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 45 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Serial Interface Specifications Mode Selection RS-232/422/485 software selectable RS-232 lines TXD, RXD, RTS, CTS, DTR, DSR, DCD, GND RS-422 lines TXDA(-), TXDB(+ ), RXDA(-), RXDB(+), GND RS-485 lines (2 wire) Data(-), D[...]

  • Page 50

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 46 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Network Specifications Memory Serial Memory 10 K bytes per port Network Memory 10 K bytes I/P Port Addresses 5300 Configuration setting in TCP Mode 8888 MESR9xx updat e Network Communications LAN 10/100 Mbps Auto-detecti[...]

  • Page 51

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 47 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Appendix C: Dimensional Diagrams Figure 29. Dimensional Diagram of an MESR901 Modbus Gateway (Not e: Small Case Used for MESR901 Series Units)[...]

  • Page 52

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 48 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Figure 30. Dimensional Diagram of an ME SR902T Modbus Gateway (Note: Small Case Used for MESR902 Series Units)[...]

  • Page 53

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 49 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Figure 31. Dimensional Diagram of an MESR921 Modbus Gateway, Left and Right Side Views (Note: Medium Case Used for MESR921 and MESR922 Series Units)[...]

  • Page 54

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 50 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Figure 32. Dimensional Diagram of an MESR921 Modbus Gateway, Botto m, Top, Back and Front Views (Note: Medium Case Used for MESR921 and MESR922 Series Units)[...]

  • Page 55

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 51 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Appendix D: Connector Pinouts MESR901-x Serial Port Pinouts DB-9M Pin RS-232 1 DCD 2 RXD 3 TXD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS 9 RI[...]

  • Page 56

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 52 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Terminal RS-422 RS-485 A TXA(-) DATA- B TXB(+) DATA+ C RXA(-) --- D RXB(+) --- E GND GND[...]

  • Page 57

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 53 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ MESR902D-x Serial Port Pinouts DB-9M Pin RS-232 RS-422 RS-485 1 DCD RXA(-) --- 2 RXD RXB(+) --- 3 TXD TXB(+) DATA+ 4 DTR TXA(-) DATA- 5 GND GND GND 6 DSR --- --- 7 RTS --- --- 8 CTS --- --- 9 RI --- ---[...]

  • Page 58

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 54 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ MESR902T-x Serial Port Pinouts Terminal RS-232 RS-422 RS-485 A RTS TXA(-) DATA- B TD TXB(+) DATA+ C CTS RXA(-) --- D RD RXB(+) --- E GND GND GND In the RS-422 mode, TX lines are outputs an d RX lines are inputs. Connect [...]

  • Page 59

    9. Appendices Vlinx MESR9xx Modbus Gateway Page 55 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Standard Ethernet Cable RJ-45 Pin-out RJ-45 Pin Signal Wire Color 1 TX+ White-Green 2 TX+ Green 3 RX+ White-Orange 4 Not used Blue 5 Not used White-Blue 6 RX- Orange 7 Not used White-Brown 8 Not used Brown[...]

  • Page 60

    10. Glossary Vlinx MESR9xx Modbus Gateway Page 56 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ 1 1 0 0 . . G G l l o o s s s s a a r r y y Term Definition ADU Application Data Unit ASCII American Standard Code for Information Interchange Baud Rate Number of bits per second CRC Cyclical Redundancy Checking Data Bits[...]

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    10. Glossary Vlinx MESR9xx Modbus Gateway Page 57 Manual Documentation Number MESR9xx-4508 m www.bb-elec.com/ www.bb-europe.com/ Term Definition Parity Bit A binary digit that is added to ensure that the num ber of bits with value of one in a given set of bits is always even or odd. It may also be a Mark (1), or a Space (0). PDU Protocol Data Unit [...]