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HP 27130A
Table 3-6. SIO Special Functions (Continued)
SIO
SIO
MUX CARD
NO.
MNEMONIC
MNEMONIC
FUNCTION
1
DTRB-
HLED-
Active LOW.
When a55erted) the LED on
(OUTPUT)
the diagnostic hood i5 on.
To assert the HLED- signal) a 1 must be
be 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
422
RTSB-
-
-'IfIN---o
+5V
LED
SIO
61
RSTB-
\/
ON-BOARD LED
c)
GND
Figure 3-3. Control Circuit for the MUX Card LED
3-17
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