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Chapter 3: Installation
Figure 3-1. Loopback function.
Table 3-6. S3 switch (UP is OFF, DOWN is ON).
Switch Position
1
2
3
4
Hardware Control Enable
(Note 1)
Disabled
OFF
Line Distance
(Note 2)
Short (less than 1000 ft.)
OFF
OFF
Reserved
OFF
NOTES:
1. When hardware control is enabled, both control input signals must be high for
transmission to be enabled.
2. The long and short line distance switches control the current output of the line
driver. These switches should be OFF for distances less than 1000 feet, and
should be ON for distances greater than 1000 feet.
