DIRECTV R15 Installation Guide - Page 41

Low-Speed Signaling Conventions

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DIRECTV Set-Top Box Information for the Installer Table 8-4: Passive Drive Characteristics Parameter Output Specification -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". DIRECTV, Inc. Version 2.2 Page 41 of 42 March 5, 2008 DTV-MD-0058

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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”.