B&B Electronics MESR321_SL_ML - Manual User Manual
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10. Glossary
Vlinx MESR321 Modbus Gateway
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MESR321-xx_R001_2113_m
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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
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
RS-232
Interface between Data Terminal Equipment and Data Circuit-
Terminating Equipment Employing Serial Binary Data Interchange