7
There is an 8-pole onboard DIL switch for changing various
settings of the adapter. Functions of the switches:
1) ON – RS485 (-) connected to RS232/RS485 SUB-D connector
OFF – RS485 (-) not connected to RS232/RS485 SUB-D
connector
2) ON – RS485 (+) connected to RS232/RS485 SUB-D connector
OFF – RS485 (+) not connected to RS232/RS485 SUB-D
connector
3) ON – 120 Ohm terminator resistor connected to RS485 line
OFF – resistor disconnected
4) Same as previous (NB! Both switches have to be ON to
enable the resistor!)
5) Not used
6) ON – data coming from RS232/RS485 bus will be transferred
for 5 minutes after last data flow has been received from
Ethernet. After 5 minutes, RS232/RS485 data transfer will
stop
OFF – data coming from RS232/RS485 bus will be
transferred continuously
7) ON – RS485 synchronisation switched on, multiple nodes
get access to adapter one by one
OFF – RS485 synchronisation switched off, the “fastest”
node gets access first
8) ON – RS485 enabled
OFF – RS232 enabled
Cabling
RS232: maximum calble length 15 m
RS485: maximum calble length 1000 m,
24 AWG solid copper
unshielded or shielded twisted pair. 2 terminating resistors
(120 Ohm) are placed across data lines in both ends of the
network (NB! The adapter has built-in switchable terminating
resistor). Daisy-chained network topology preferable.
Ethernet: maximum cable length 100 m, twisted pair (CAT5)
