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HP 27130B
Table 3-6. SIO Special Functions (Continued)
SID
SID
MUX CARD
NO.
MNEMONIC
MNEMONIC
FUNCTION
1
DTRB-
HLED-
Active LOW.
When asserted, the LED on
(OUTPUT)
the diagnostic hood is on.
To assert the HLED- signal, a 1 must be
be written into bit 7 of SID 1 channel B,
register 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
#0
422
RTSB
,..
+5\1
'"
LED
SIO #1
RSTB-
V
ON-BOARD
lED
I
GND
o
Figure 3- 3. Control Circuit for the MUX Card LED
3-18
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