B&B Electronics 485T Uživatelský manuál stáhnout pdf (Strana 11)

Owners Manual

2800 Series Marquee

1.8 Multi Drop, Half-Duplex, RS-485 Wiring

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

marquees are less than four thousand cable feet away from the PC/PLC, then multi-drop, half-duplex, RS-485

communications wiring may be used. RS-485 is typically less convenient than RS-232 due to the required

converter, however RS-485 can be used over much longer distances with up to sixty three drops. Half duplex

communication links allow the marquees to send information back to the controlling PC/PLC over the same wires

used to send data to the marquees, but it is the responsibility of the control system programmer to avoid RS-485

packet collisions.

PB-2149-335B Page 7

(3) TXD

(3) RD(2) RXD

+12VDC

GND

(2) TD

(5) GND (7) GND

RS-232

485TBLED

RS-485

RTSOFF

SDON

ECHO CONTROL

12VDC

Supply

2nd 2800 DB25 Connector

(21) GND

(18) 485-

(17) 485+

1st 2800 DB25 Connector

(21) GND

(18) 485-

(17) 485+

3rd 2800 DB25 Connector

(21) GND

(18) 485-

(17) 485+

RS-485 TO

(60) MORE

MARQUEES

RS-485 Cable May Not Exceed

4000 Feet in Length or 63

Marquee Drops Maximum

ALI Suggests Using an 485TBLED

Converter, Purchased from

B&B electronics

Phone: (815) 433-5100

www.bb-elec.com

3rd 2800 DIN RAIL

RS-232 OUT

RS-232 IN

RS-485 -

RS-485 +

SIGNAL GND

120VAC NEUT

120VAC HOT

EARTH GND

LB-2815-006

2nd 2800 DIN RAIL

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

RS-232 OUT

RS-232 IN

RS-485 -

RS-485 +

SIGNAL GND

120VAC NEUT

120VAC HOT

EARTH GND

LB-2815-006

(3) TXD

(3) RD(2) RXD

+12VDC

GND

(2) TD

(5) GND (7) GND

RS-232

485TBLED

RS-485

RTSOFF

SDON

ECHO CONTROL

12VDC

Supply

RS-485 TO

(60) MORE

MARQUEES

RS-485 Cable May Not Exceed

4000 Feet in Length or 63

Marquee Drops Maximum

ALI Suggests Using an 485TBLED

Converter, Purchased from

B&B electronics

Phone: (815) 433-5100

www.bb-elec.com

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