ApexRp Operators Manual
248083480-1 Rev 3 34
RS-485 Communications
RS-485 must be used if the instrument is more than 50 feet from a
computer or is installed in an industrial network. Refer to Table 4-5
for specifics about RS-485. Contact Lighthouse Technical Support for
more information.
Table 4-5 shows the Electronics Industry Association (EIA) industry
Standards RS485 specifications.
Total Number of Drivers and Receivers on
One line (one driver active at a time for RS-
32 Receivers
Maximum Data Rate (40 ft – 4000 ft for
RS422/RS-485)
Maximum Driver Output Voltage
Driver Output Signal Level (Loaded Min.):
LOADED
Driver Output Signal Level (Loaded Max.):
UNLOADED
Driver Load Impedance (Ohms)
Max Driver Current in High Z State
(POWER ON)
Max Driver Current in High Z State
(POWER OFF)
Receiver Input Voltage Range
Receiver Input Sensitivity
Receiver Input Resistance (Ohms), (1
Standard Lad for RS-485)
Table 4-5 EIA Industry Standards for RS-485 Communications
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