DIRECTV Set-Top Box Information for the Installer
DIRECTV, Inc.
March 5, 2008
Version 2.2
Page 41 of 42
DTV-MD-0058
Table 8-4: Passive Drive Characteristics
Parameter
Specification
Output
-2 mA
±
20% at + 3 volts and –10
mA
±
20% at –5 volts
8.5 Low-Speed Signaling Conventions
The data port signaling conventions will be as listed in Table 8-5.
Table 8-5: Low-Speed Data Port Signaling Conventions
Interchange Voltage
Negative or Positive
Binary state
1 or 0
Signaling state
mark or space
Function
OFF or ON
The idle state for data port pins two (2) and three (3) will be “mark”.