B&B Electronics 485T Manual de usuario descargar pdf (Pagina 9)

Owners Manual

2800 Series Marquee

1.6 Multi Drop, Simplex, RS-232 Wiring

If at least two, but no more than eight marquees will be controlled from the PC or PLC, and all of the marquees

are less than fifty cable feet away from the PC/PLC, then multi-drop, simplex, RS-232 communications wiring may

be used. RS-232 is typically more convenient than RS-485 communications, but RS-232 can only be used over

short distances with a maximum of eight drops. Simplex wiring schemes do not provide a way for the marquees

to send data back to the PC/PLC, however few applications require data be sent back from the marquees so this

typically does not cause any problems.

PB-2149-335B Page 5

(3) TXD

(5) GND

Standard PC DB9

Connector Illustrated

RS-232 TO

(6) MORE

MARQUEES

Cable May Not Exceed Fifty Feet in Length

or Eight Marquee Drops

2ND 2800 DB25 Connector1ST 2800 DB25 Connector

(14) 232 IN(14) 232 IN

(21) GND(21) GND

RS-232 OUT

RS-232 IN

RS-485 -

RS-485 +

SIGNAL GND

120VAC NEUT

120VAC HOT

EARTH GND

LB-2815-006

1ST 2800 DIN RAIL