B&R Automation PC 3100 User Manual page 100

Technical data
4.7.4.15.3.5 Terminating resistor
A terminating resistor is already integrated on the IF option for each COM. This can be switched on or off with a
switch; it is necessary to open the system unit for this.
The terminating resistors are switched off on delivery. The state of the respective terminating resistor is indicated
by an LED (see "Reading LED status indicators" on page
Assignment
1) COM C terminating resistor
2) LED status indicator for COM C terminating resistor
Color: Yellow
3) COM D terminating resistor
4) LED status indicator for COM D terminating resistor
Color: Yellow
4.7.4.15.3.6 Firmware
In order to ensure the functionality of the interface option, at least the following firmware version (MTCX) must be
installed on the PC:
• Automation PC 3100: V4.21
• Panel PC 3100: V4.21
The firmware can be downloaded from the B&R website (www.br-automation.com).
For information about upgrading the firmware, see section
100
241).
State Explanation
On Enabled
Off Disabled
On COM C terminating resistor on
Off COM C terminating resistor off
On Enabled
Off Disabled
On COM D terminating resistor on
Off COM D terminating resistor off
"PC firmware upgrade" on page 177.
Automation PC 3100 User's manual V 2.10