Honeywell CIPer 50 Installation & Commissioning Instructions page 18

CIPer MODEL 50 CONTROLLER – INSTALLATION AND COMMISSIONING INSTRUCTIONS
TM
Configuring the RS485 Interfaces in WEBs N4
When you configure the two RS485 interfaces (for Modbus, BACnet MS/TP, or Panel Bus) in WEBs N4, the
corresponding Port Names will appear as shown in Figure 13.
RS485-1 Bias and Termination Resistors
RS485-1 is equipped with a three-position slide switch which can be used to switch its bias resistors OFF
(position "MID" – this is the default), ON (position "BIAS"), and ON with an additional 150Ω termination
resistor (position "END").
The recommended slide switch setting depends upon the location and usage of the given CIPer Model 50 –
see Figure 15 through Figure 17 and Table 5; it also depends upon the selected communication protocol
(BACnet MS/TP, Panel Bus, or Modbus RTU Master communication, respectively).
Setting Remarks
END Controllers located on either end of bus should have this setting.
In small bus networks, a min. of one and a max. of two controllers should have this
BIAS
setting.
All other controllers (not set to "END" or "BIAS") on bus should have this setting
MID
(which is the default).
31-00233-02
Figure 13: Configuring the RS485 interfaces in WEBs N4
3-POSITION SLIDE SWITCH
Figure 14: RS485-1 three-position slide switch
Table 5. Recommended slide switch settings
RS485-1
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