X20 system modules • Bus controllers • X20BC0043
510
X20 system User's Manual 3.10
4.5.2.7 Terminating resistor
On
Off
Terminating resistor switch
A terminating resistor is already integrated on the bus controller. It can be turned on and off with a switch on the
bottom of the housing. An active terminating resistor is indicated by the "TERM" LED.
4.5.2.8 Node number and transfer rate
Node numbers and transfer rates are configured using the two bus controller number switches.
The transfer rate can be specified in two ways:
•
Automatic detection by bus controller (see 4.5.2.9 "Automatic transfer rate detection" on page 511)
•
Fixed definition by user (see 4.5.2.10 "Setting the transfer rate" on page 511)
Switch position
Node number
Transfer rate
0x00
Not allowed
-
0x01 - 0x7F
1 - 127
Automatically set by the bus controller (default) or fixed setting
by the user
0x80 - 0x88
-
Sets a fixed transfer rate
0x89
-
Sets automatic transfer rate detection
0x8A - 0x8F
Not allowed
-
0x90
Clearing the parameters
See section 4.5.2.11 "Deleting parameters" on page 512
-
0x91 - 0xFF
Not allowed
-
Table 114: Node numbers and transfer rate