Zilog EZ80190 User Manual
Page 43
eZ80190 Development Kit
User Manual
UM014108-0810
Operational
Description
39
Jumper J16
The J16 jumper connection controls the selection of the RS485 circuit.
However, UART1 MODEM interface and the socket modem interface are
disabled if the RS485 circuit is enabled. When the shunt is placed, the
RS485 circuit is enabled. See Table 19.
Jumper J17
The J17 jumper connection controls the selection of the RS485 termina-
tion resistor circuit. When the shunt is placed, the RS485 termination
resistor circuit is enabled. See Table 20.
Table 19. J16—RS485_2_EN
Shunt
Status
Function
Affected Device
In
The RS485 circuit is enabled on UART1. The
UART1 MODEM interface and the Socket
Modem interface are disabled.
UART1 MODEM interface,
Socket Modem Interface, and
RS485 interface.
Out
The RS485 circuit is disabled on UART1.
UART1 MODEM interface,
Socket Modem Interface, and
RS485 interface.
Table 20. J17—RT_1*
Shunt
Status
Function
Affected Device
In
The Termination Resistor for RS485_1 is IN.
RS485 interface.
Out
The Termination Resistor for RS485_1 is OUT.
RS485 interface.
Note: *Before enabling the termination resistor, ensure that the device is located at the end of the
interface line.