+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: General Forum (/forum-4.html)
+--- Thread: HP 48GII USB / Serial Pinout (/thread-17959.html)
HP 48GII USB / Serial Pinout - Tracer21 - 01-22-2022 11:30 PM
The 48GII is unique in that is has a MiniUSB Port that exposes the serial UART connections (as opposed to being like a normal USB connection like the 49G+ and 50G).
To connect a 48GII to a computer, you'll need a USB to UART adapter with 3.3V outputs (the Samsung CPU uses 3.3V I/O) and a MiniUSB cable cut open.
Connections:
MiniUSB Cable | UART
Ground (Black) | Ground
D+ (White) | RX
D- (Green) | TX
You'll need to select the correct COM Port from the Connectivity Kit and choose 115200 Baud