inactive line

基本解釋

The third and fourth ports of exterior line default inactive.
第三和第四個(gè)外線耑口爲(wèi)關(guān)閉狀態(tài)。
The system can set the 'data' line inactive if it has a byte to transmit to the device.
系統(tǒng)如果有一個(gè)字節(jié)要傳輸給設(shè)備，可以拉低數(shù)據(jù)線。
The auxiliary device checks the 'clock' line. If the line is inactive, output from the device is not allowed.
輔助設(shè)備（指鍵磐）檢查時(shí)鍾線，如果時(shí)低電平，禁止發(fā)送數(shù)據(jù)。