4-Port 422/485 Serial PCIe Card
4
Termination Resistor Disabled
(Default)
Termination Resistor Enabled
3.
Echo or No Echo Settings: JP3 (for S1~S4) 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.
JP3 (for S1~S4)
Description
No echo data
(Default)
Transmission data will be echoed
4.
TXD Control Selector: JP2 (for S1~S4):
This jumper is used to select the control signal for the transmitter
buffer in RS485 2-wire mode. There are 2 settings are selectable,
O
N
O
FF
OFF ON
ECHO
OFF ON
ECHO
O
N
O
FF
