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HP 27130A Technical Reference Manual
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HP 27130ATable 3-6. SIO Special Functions (Continued)SIO SIO MUX CARDNO. MNEMONIC MNEMONIC FUNCTION1 DTRB- HLED- Active LOW. When a55erted) the LED on(OUTPUT) the diagnostic hood i5 on.To assert the HLED- signal) a 1 must bebe written into bit 7 of SIO 1 channel B)regi5ter 5.On power up (reset») HLED- is unasserted, i . e: ,the LED on the diagnostic hood is off.No modem control lines or modem status inputs are used.SIO /10 422RTSB- - -'IfIN---o +5VLEDSIO 61RSTB-\/ ON-BOARD LEDc) GNDFigure 3-3. Control Circuit for the MUX Card LED3-17 |
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