B&B Electronics MESR9xx manual Pdu

10. GlossaryVlinx MESR9xx Modbus Gateway

Term	Definition
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
RS-422	Electrical Characteristics of Generators and Receivers for Use in Balanced
	Digital Point to Point Systems
RS-485	Electrical Characteristics of Generators and Receivers for Use in Balanced
	Digital Multipoint Systems
RTU	Remote Terminal Unit
Stop Bit	Number of bit times after a character is transmitted before the next character
	can start transmission.
TCP	Transmission Control Protocol
Unit ID	Unit Identifier. This is the same as the slaves address.
VESR	B&B’s Second Generation Ethernet Gateway Line
Vlinx	B&B’s family name for the Gateway line

Page 57	Manual Documentation Number MESR9xx-4508m
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