Lighthouse RLPC 0.1m, Operating Manual

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Lighthouse REMOTE Liquid Particle Counter (MODBUS Output) Operating Manual
4-8 248083227-1 Rev 8
Make sure that each RLPC has a unique address (non-zero) or a
conflict will result and data will be lost.
The RLPC complies with EIA’s RS485 standards for distances and
number of devices on a chain. See Table 4-7.
Table 4-7 EIA Industry Standards for RS485 Communications
SPECIFICATIONS RS485
Mode of Operation Differential
Total Number of Drivers and Receivers on
One Line (One driver active at a time for
RS485 networks) 32 Drivers
32 Receivers
Maximum Cable Length 4000 ft. (1,219.2 m)
Maximum Data Rate (40 ft. - 4000 ft. for
RS422/RS485) 10Mb/s - 100Kb/s
Maximum Driver Output Voltage -7V to +12V
Driver Output Signal Level (Loaded
Min.): LOADED +/-1.5V
Driver Output Signal Level (Loaded
Max.): UNLOADED +/-6V
Driver Load Impedance (Ohms) 54
Max Driver Current in High Z State
(POWER ON) +/-100
μ
A
Max Driver Current in High Z State
(POWER OFF) +/-100
μ
A
Receiver Input Voltage Range -7V to +12V
Receiver Input Sensitivity +/-200mV
Receiver Input Resistance (Ohms), (1
Standard Load for RS485) >12k