Fairbanks FB2255 Series Instrument PC2255 PC Software Utility Program - Manual (Page 43)

Section 6: Fieldbus/Bluetooth
01/13 43 51297 Rev. 1
5.2.4. PROFIBUS ( 29576 )
PROFIBUS is one of the best-known industrial
fieldBus protocols from Europe.
– It is an established standard, used in a wide
range of applications as a multi-application
communications link for industrial devices.
– The ProfiBus protocol was originally
developed by a committee founded by the
German government.
PROFIBUS utilizes a non-powered two-wire (RS-485) Network.
– A ProfiBus Network may have up to 126 nodes, transferring a maximum of
244 bytes data per node/ per cycle.
– Baud (Communication) Rates are selectable, and overall end-to-end network
distance varies with speed.
– The maximum standard Baud Rate is 12Mbps, with a maximum distance of
100M (328ft), and 1200M (3936 ft.) at 93.75Kbps without repeaters.
– PROFIBUS connects to a wide variety of field devices including the
following:
▪ Discrete and analog I/O Drives.
▪ Robots.
▪ HMI/MMI products.
▪ Pneumatic valves.
▪ Barcode readers.
▪ Weigh scales.
▪ Transducers.
▪ Flow measuring equipment.
PIN SIGNAL DESCRIPTION
3 B-Line Positive RxxD/TxD, Rs485 level
4 RTS Request to Send
5 GND Ground (Isolated)
6 +5 Bus
Output +5V termination power (Isolated,
short circuit protected)
8 A-Line Negative RXD/TxD, RS485 level