Breakout cable
Pin
Signal
shell
GND 33
2
RS422_TS2-
7
RS
Table 4-20: RS-422 connector #4
Pin
Signal
8
RS422_RS3-
3
RS
shell
GND 58
2
RS422_TS3-
7
RS
Table 4-21: RS-422 connector #5
Pin
Signal
8
RS422_RS4-
3
RS
shell
GND 6
2
RS422_TS4-
7
RS
Table 4-22: RS-422 connector #6
Pin
Signal
8
RS422_RS5-
3
RS
shell
GND 36
2
RS422_TS5-
7
RS
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
