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17
CHAPTER 3: Installation
Table 1 (continued). DCE Jumper Settings.
Function Jumper Requirements
7. RS-485 interface terminated
or unterminated
• Terminated S2 in TERM position
• Unterminated S2 in UNTERM position
8. Normal or loopback operation
• Normal mode S1 in Normal position
• Loopback mode S1 in Loopback position
9. RS-485 Interface Line Biased (Fail- S3 Off No line bias
Safe), Receive
S3 On Line biased
NOTE
If line bias is on, the RS-485 CD will ALWAYS be on.