RS485 COMMUNICATION OPTION
GENERAL
Configuration Four wire, Half Duplex
Maximum fan-out 32 units
(viii)
Baud Rate 9600
Data bits 8
Start bits 1
Stop bits 1
Parity none
Maximum line length 4km
Protocol based on ANSI X3.28
TRANSMITTER
Maximum differential output voltage 5v
Output voltage with 50ohm load >1.5v
RECEIVER
Differential input threshold voltage +/-200mV
Input receiver impedance 12kohms
Common mode range -7v to +12v
ENVIRONMENTAL
Ambient operating temperature range 0 to 50°C
Ambient storage temperature range -20 to 80°C
Relative Humidity 20% to 95% non condensing
EMI Emissions BS EN61326
EMI Susceptibility BS EN61326
Safety BS EN61010-1
Power Supply 240VAC,110VAC,24VAC 50/60Hz
Power consumption 6.5Watts max
Max in-rush current 100mA @240VAC
Front panel sealing(with gasket) IP65
APPENDIX B
Page 78
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