2-Port 422/485 Serial PCIe Card
4
Termination Resistor Enabled
3.
Echo or No Echo Settings: This jumper is to set the
transmission data will be echoed back or not.
The Echo
mode is useful for the application program to detect if the RS485
bus has collision. If the echoed data was not equal to the
transmitted data, then the bus was in a collision. This setting only
affects the RS485 2-wire mode. It doesn’t affect RS485 4-wire,
and RS422 modes.
JP5 (for S1)
JP6 (for S2)
Description
No echo data
(Default)
Transmission data will be echoed
4.
TXD Control Selector: JP2 (for S1) and JP3 (for S2):
This jumper is used to select the control signal for the transmitter
buffer in RS485 2-wire mode. There are 2 settings are selectable,
one is “MAN” (manually) the other one is “AUT” (automatically,
factory default), please keep it at “AUT” in all cases.
JP2 (for S1)
JP3 (for S2)
Description
OFF ON
ECHO
OFF ON
ECHO
O
N
O
FF
