Communication Set Up
248083317-1 Rev 4 4-5
Connecting to a PC
To connect the instrument to a computer using RS485 Protocol:
1. Remove power from the instrument.
2. Connect the RJ45 end of the LWS RS485 converter cable to the
REMOTE-4PN Data Port.
3. Connect the USB end of the RS485 converter to any available USB
port on the computer and wait for computer to install drivers.
4. Make sure each REMOTE-4PN has a unique non-zero address or
data will be lost then power on the instrument.
The REMOTE-4PN complies with EIA’s RS485 standards in Table 4-4.
Table 4-4 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)
+/-100μA
Max Driver Current in High Z State
(POWER OFF)
+/-100μA
Receiver Input Voltage Range -7V to +12V
Receiver Input Sensitivity +/-200mV
Receiver Input Resistance (Ohms), (1
Standard Load for RS485)
>
12k
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