
10. Glossary
Vlinx MESR9xx Modbus Gateway
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Manual Documentation Number MESR9xx-4210m
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9.
Glossary
9. Glossary
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
Number of bits per byte, normally 7 with Modbus ASCII, and 8 with
Modbus RTU
DHCP
Dynamic Host Configuration Protocol
Flow Control
The process of managing the rate of data transmission between two nodes.
Function Code
A code field that tells the Gateway what kind of action to perform
Modbus
Gateway
A bridge to get from Modbus TCP to Modbus Serial
GUI
Graphical User Interface
IP
Internet Protocol
IPv4
Internet Protocol version 4
LED
Light emitting diode. Used as a visual indicator
MBAP
MODBUS Application Protocol
MEI
Multi Electrical Interface via RS-232/422/485
MES1A
B&B’s Ethernet Modbus gateway, RS-232 on serial port
MES1B
B&B’s Ethernet Modbus gateway, RS-422/485 on serial port
MESR922T
B&B’s Ethernet Modbus gateway, Dual Ethernet ports, Dual serial ports
with MIE and terminal blocks
Modbus
A request/reply protocol and offers services specified by function codes.
Parity Bit
A binary digit that is added to ensure that the number 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