Citizen Systems BD2-2220 - Manual (Page 290)

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●MSW7-6： DMA control
[Outline] Select the enable/disable of DMA (Direct Memory Access) control.
Setting Value
DMA control Valid, Invalid
●MSW7-7： VCom flow control
[Outline] In MSW5-3, select the flow control when virtual COM is set.
Setting Value
VCom Protocal PC setting, DTR/DSR, XON/XOFF