Zilog EZ80L92 User Manual
Page 42
eZ80L92 Development Kit
User Manual
Operational Description
UM012913-0407
38
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
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. 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.