GDA-HLU1 is a USB-to-RS485 adapter（automatic data direction control）for all Gicren's standard devices、whose conversion mechanism is "USB ＜-＞ UART（FT232RL）＜-＞ RS485（SP485EEN）"、so it can also be used for other general purpose via pin header、such as "USB＜-＞UART"、"USB＜-＞RS485" and "UART＜-＞RS485".
Features：Taking into account security issues、there are only D+ and D- pins connected to SP485EEN. In other words、the front-end circuit and back-end circuit do not share the same ground in the printed circuit board、but it is recommended to connect them manually to avoid excessive common-mode voltage when you are sure the connection is correct.
In addition、the onboard high-quality D-Sub-9Pin-Female、SMT-PH2.0-9Pin、Header-2.54mm-Pitch-9Pin、fuse and selectable matching resistor make this adapter more flexible and reliable.
