This problem can be misinterpreted as a problem with a multi-port card or a driver from MOXA, however, it is caused by Microsoft Windows 2000 / XP / 2003 / 7 OS.
Galvanic isolation on a MOXA device is performed by means of an optron, that converts an electric signal into light and then converts light back into the electric signal on the other side of the isolator. Hence, two electric circuits are completely isolated from each other.
The devices that have the letter L in their names feature galvanic isolation, for instance: NPort 5232I or UPort 1150I. The breakdown strength is given in the specification for every device.
In this document, the possibility of using S-232/422/485 interfaces for building Ethernet networks is described, and the equipment setup example for similar tasks is given.
Get a pinout diagram for a device to be connected and NPort. MOXA observes the standards and defines signal B as positive and signal A as a negative one. On all MOXA devices with DB9 pinout, signal B is provided on PIN3, signal A is provided on PIN4.
Connect a positive signal (B) of NPort with a positive signal (B) of a device. Connect an NPort negative signal (A) with that of a device.
Make sure, 2-wire RS-485 mode is set in NPort configuration.
Some manufacturers use non-standardized output designation, so, you might need to interchange A and B contacts.
Such situation may happen with devices, designed on the basis of Maxim MAX483 microchip.
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