Zilog eZ80F92 User Manual
Page 43
eZ80F92 Development Kit
User Manual
UM013911-0607
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 20.
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 21.
Table 20. 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 21. 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.