Zenisu Keisoku,Inc. ZS-6220H, Руководство пользователя

Страница: 22 / 34

- 22 -
(2) The data that is input from parallel port, send to the PC.

Synchronous input
It activates the UAR output and waits for the STRT pulse. It takes 4 bits of data from the
input port and transmits it to the PC.
End transmission to USB
Data hold
Input data
ＳＴＡＲＴ
UAR output
Positive logic

Asynchronous input
When the “S” command comes from the PC, it captures data from the input port and
transmits it to the PC without worrying about the state of the signal like the
synchronous input.
6. API function
6.1. List of functions
Function name Description
ZupOpen Open the USB port and initialize
ZupClose Close the USB port and execute driver termination processing.
ZupRead Data is read from all input ports.
ZupWrite Data is written to the output port.
ZupTrigger Output the pulse from the TRG signal.
ZupClear Output the pulse from the CLR signal.