Solvline PCIe - Manual (Page 23)

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Windows Device Driver Configuration
2. At the Hardware Configuration setting, Auto Toggling setting is disabled at RS232
mode and RS422 point to point mode. Also, At RS422 multi-drop mode, Auto Toggling
setting is fixed to HW Auto toggling.
(Multi-4/PCIe RS232 card Installation Setting View)
3. At the Hardware Configuration setting, Auto Toggling setting is active at RS485
Echo/Non Echo mode. Auto Toggling setting is set for SW Auto Toggling in standard. If
you want to use HW Auto Toggling, you modify the Auto Toggling settings.