Zilog EZ80F91 - Manual (Page 43)

eZ80F91 Development Kit
User Manual
UM014220-0508 eZ80 Development Kit
38
disabled if the RS-485 circuit is enabled. When the shunt is placed, the
RS-485 circuit is enabled. See
Table 23 .
Jumper J17
The J17 jumper connection controls the selection of the RS-485 termina-
tion resistor circuit. When the shunt is placed, the RS-485 termination
resistor circuit is enabled. See
Table 24 .
Jumper J18
The J18 jumper connection controls the selection of the RS-485 termina-
tion resistor circuit. When the shunt is placed, the RS-485 termination
resistor circuit is enabled. See
Table 25 .
Table 23. J16—RS485_2_EN
Shunt
Status
Function Affected Device
IN The RS-485 circuit is enabled on UART1.
The UART1 MODEM interface and the
Socket Modem interface are disabled. UART1 MODEM interface,
Socket Modem Interface, and
RS-485 interface.
OUT The RS-485 circuit is disabled on UART1. UART1 MODEM interface,
Socket Modem Interface, and
RS-485 interface.
Table 24. J17—RT_1*
Shunt
Status
Function Affected Device
IN The Termination Resistor for RS485_1 is IN. RS-485 interface.
OUT The Termination Resistor for RS485_1 is OUT. RS-485 interface.
Note: *Before enabling the termination resistor, ensure that the device is located at the end of the
interface line.