FX16 Master Controller Technical Bulletin 33
• Do not run the null modem cable close to transformers or
high frequency generating equipment.
RS-232C/RS-485 Connection
In case the distance between the controller and the personal computer
needs to be bigger than 15 m (49.2 ft) (up to 1,200 m [4,000 ft]), you
need to insert an RS-485 trunk between the computer and the FX16. See
Figure 29.
Figure 29: RS-485 Connection in Null Modem Configuration
Consider the following information when you work with an RS-485 in a
null modem configuration:
• Use two RS-232/RS-485 converters and set to full-duplex mode.
Cross connect the two converters as described in
Table 7.
Table 7: Cross Connect RS-232/RS-485 Converters
Converter 1 Converter 2
XT+ RC+
XT- RC-
RC+ XT+
RC- XT-
IMPORTANT: Do not use the Johnson Controls® IU-9100, as it can only
work in half-duplex mode.
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