Revision 4 : 11/2009

Introduction

The BLA is a fast RS232 to RS485 interface.

• automatic TX enable circuit.
• bias, termination.
• The unit has three LED indicators for TX/RX/RTS
• isolation between the RS232 and RS485
• Rail mount

Application

• Serial Communication.
• Digital Fieldbus.
• RS485.
• Board-To-Board Communication.
• Ground Loop Elimination.

Jump configuration.

JP1 : End Of Line resistor

JP4 : Direction RS485 : 1-2 = Auto

Nb data Bits = Start + data + Stop + No Parity : 8,N,1 10 bits

Default position : 9600,8,N,1

Specifications

Interface 1 : EIA RS232 screw-terminal

Interface 2 : EIA RS-485

Data rate : Up to 76800 bit/s

Indicator : Power, TD, RD, RTS

Insulation : galvanic insulation with opto-coupler 1500V

Power supply : 9-24 VAC/DC

Fuse : 1 x 500mA or 47 Ohm – 1/4 W.

Power consumption : Max 5VA

Temperature range : 5-50°C

Humidity : 0-95% RH non-condensing

Dimension : 120 x 65 x 40 ( B x D x H )