Rs 485 Interface - Bartec BAT VGA pro Manuel D'installation

Operator´s manual for BAT VGA pro
Version 1.1
4.4

RS 485 interface

BARTEC supplies all the RS 485 interfaces as RS 422.
Connection of a controller via an RS 485 interface of the display terminal.
RS485 module
Terminal compartment of the terminal
TxD B (TxD+)
Data Out
TxD A (TxD-)
Tx enable
RxD B (RxD+)
Data In
RxD A (RxD-)
See the interface description from the controller manufacturer for the relevant pin assignment of the controller.
If it is intended to use the RS 422 as an RS 485 interface, pin 3 / pin 5 and pin 4 / pin 6
must be bridged externally.
Pins 1-5, 2-6, 3-7, 4-8 are already connected inside.
In most cases, internal EMC measures allow the installation of termination resistors at the beginning and the
end of the bus line to be dispensed with.
Depending on local conditions, there might occasionally be impairments of data transfer.
E_BMS00680_Rev7.doc • Operator´s manual for BAT VGA pro • Revision 7 / Status: 29. January 2004 • Technical data subject to change
9
10
PE
Controller
TxD B (TxD+) / RxD B (RxD+)
TxD A (TxD-) / RxD A (RxD-)
to other display terminals
if final device
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