TWR-SER2 User’s Manual
Page 16 of 17
4.2
Jumper Settings
Jumper Options
Setting
Description
J1
RS232/485 RX Select (UART 1)
1-2
RS485 Mode (connects RX to RO)
*2-3*
RS232 Mode (connects RX to R1OUT)
J2
RS232/485 TX Select (UART 1)
1-2
RS485 Mode (connects TX to DI)
*2-3*
RS232 Mode (connects TX to T1IN)
J4
CAN Isolation
1-2
Connects CAN_S to S
3-4
Connects CAN_TX to TXD
5-6
Connects CAN_RX to RXD
J7
JS16 RS232 Isolation (UART 0)
*1-2*
Connects RX to S08JS16 RXD
*3-4*
Connects TX to S08JS16 TXD
J8
Power Down Port B
1-2
Disables Ethernet PHY B
J9
Power Down Port A
1-2
Disables Ethernet PHY A
J11
RS485 Config (UART 1)
1-2
Loopback Mode (connects RE to DE)
3-4
Loopback Mode (connects TX0_P to RX0_P)
5-6
Loopback Mode (connects TX0_N to RX0_N)
7-8
NC
9-10
5V Supply to DB9
J13
RS232/485 Disable (UART 1)
*1-2*
Disables RS485
2-3
Disables RS232
J16
VBUS OC Isolation
1-2
Connects USB VBUS OC to Elevator
J21
VBUS EN Isolation
1-2
Connects USB VBUS EN to Elevator
J22
RS232 (UART2) Isolation
1-2
Connects TX to T1IN
3-4
Connects RX to R1OUT
5-6
Connects RTS to T2IN
7-8
Connect CTS to R2OUT
J23
RS232 (UART3) Isolation
1-2
Connects TX to T1IN
3-4
Connects RX to R1OUT
5-6
Connects RTS to T2IN
7-8
Connects CTS to R2OUT
J24
USB Device Mode
1-2
Device Mode (capable of powering Tower
System)
Figure 4 - TWR-SER2 Jumper Settings
