Breakout cable
Pin Signal
shell GND 33
2 RS422_TS2-
7 RS422_TS2+
Table 4-20: RS-422 connector #4
Pin Signal
8 RS422_RS3-
3 RS422_RS3+
shell GND 58
2 RS422_TS3-
7 RS422_TS3+
Table 4-21: RS-422 connector #5
Pin Signal
8 RS422_RS4-
3 RS422_RS4+
shell GND 6
2 RS422_TS4-
7 RS422_TS4+
Table 4-22: RS-422 connector #6
Pin Signal
8 RS422_RS5-
3 RS422_RS5+
shell GND 36
2 RS422_TS5-
7 RS422_TS5+
About RS-422 grounding
Note the Harmonic recommendations regarding RS-422 grounding.
• RS-422 uses differential signaling, much like balanced audio. As long as the chassis grounds of the
controller and the Spectrum device share a common ground through the AC power connections, no
ground connection is needed on the RS-422 cable.
• In some cases, grounding the RS-422 at one end and running a shield around the balanced pairs can
reduce noise pickup.
119 Spectrum System 8.4 Installation Guide
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