Rockwell Automation 22-COMM-B PowerFlex BACnet MS/TP Adapter - Manual (Page 20)

2-4 Installing the Adapter
Setting the TERM, -BIAS, and +BIAS Switches
The adapter’s TERM, -BIAS, and +BIAS switches ( Figure 2.2 ) are used
to turn on/off its built-in termination resistor and bias resistors.
Figure 2.2 Setting the TERM, -BIAS, and +BIAS Switches
Since nodes on a BACnet MS/TP network are typically a mix of
Allen-Bradley PowerFlex drives and other brands of building automation
products, the network node locations for the PowerFlex drives will
determine how their adapter’s TERM, -BIAS, and +BIAS switches
should be set.
104 0 0 0 1 0 1 1 116 0 0 1 0 1 1 1
105 1 0 0 1 0 1 1 117 1 0 1 0 1 1 1
106 0 1 0 1 0 1 1 118 0 1 1 0 1 1 1
107 1 1 0 1 0 1 1 119 1 1 1 0 1 1 1
108 0 0 1 1 0 1 1 120 0 0 0 1 1 1 1
109 1 0 1 1 0 1 1 121 1 0 0 1 1 1 1
110 0 1 1 1 0 1 1 122 0 1 0 1 1 1 1
111 1 1 1 1 0 1 1 123 1 1 0 1 1 1 1
112 0 0 0 0 1 1 1 124 0 0 1 1 1 1 1
113 1 0 0 0 1 1 1 125 1 0 1 1 1 1 1
114 0 1 0 0 1 1 1 126 0 1 1 1 1 1 1
115 1 1 0 0 1 1 1 127 1 1 1 1 1 1 1
Table 2.A MAC Address Switch Settings (UP = 1 = OPEN) (Continued)
MAC
Address
Switch Setting MAC
Address
Switch Setting
SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW1 SW2 SW3 SW4 SW5 SW6 SW7
Switches Description Default
SW1 Turns on/off the termination resistor Up (Off)
SW2 Turns on/off the -bias resistor Up (Off)
SW3 Turns on/off the +bias resistor Up (Off)
SW4 Reserved (not used) —
UP = OFF
TERM Switch (SW1)
-BIAS Switch (SW2) +BIAS Switch (SW3)
RSRV Switch (SW4)
Reserved for future use
1
4 3 2