StarTech.com PCI2S232485I - Manual (Page 7)

Instruction Manual
4
JP2 (for S1 port) / JP5 (for S2 port) JP1 (for S1 port) / JP4 (for S2 port) Description
RS232
Transmission Echo
This jumper determines if transmission data will be echoed back. The Echo mode is
useful to detect if the RS485 bus has data collision. If the echoed data is not equal to
the transmitted data, then there is collision. This setting only affects the RS485 2-wire
mode. It doesn’t affect RS485 4-wire, RS422 or RS232 modes.
JP2 (for S1 port)/JP5 (for S2 port) Description
No data echo.
(Default)
Transmission data will be echoed
back