Avalue EBM-QM87U - Manual (Page 19)

User ’s Manual
EBM-QM87U User’s Manual 19
2.3.3 Multi-function select (SW1)
ON OFF
1 AT SEL ATX SEL
2 CF Slave CF Master
3 Touch off Touch on
4 NC NC
5 BKLT Negative BKLT Positive
6 GPIO56:L GPIO56:H
2.3.4 Serial port 1/ 2
– RS485 mode select (SW2)
* Default
In Serial Port 1 mode
ON OFF
1 Auto Direction* RTS# Control
2
485TXP external
biasing resistor
OPEN*
3
485TXN external
biasing resistor
OPEN*
In Serial Port 2 mode
ON OFF
4 Auto Direction* RTS# Control
5
485TXP external
biasing resistor
OPEN*
6
485TXN external
biasing resistor
OPEN*