Getting Started
248083336-1 Rev 3 3-9
USB Communications
The 3104P or 5104P provides point-to-point communications via its
USB Port for simplified communications.
To use the port for the first time, install the USB driver provided on the
product CD. Once it has been installed and the instrument is
connected, the driver will be used to establish communications with the
3104P or 5104P using a virtual COM port on the PC.
Table 3-3 EIA Industry Standards for RS-485 Communications
SPECIFICATIONS RS-485
Mode of Operation Differential
Total Number of Drivers and Receivers on
One Line (One driver active at a time for
RS-485 networks)
32 Drivers
32 Receivers
Maximum Cable Length 4000 ft. (1,219.2 m)
Maximum Data Rate (40 ft. - 4000 ft. for
RS422/RS-485)
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 RS-485)
>12k
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