Kontron CP347, User Manual, Page: 22 / 29

CP347 – User Guide, Rev. 1.3
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3/ Configuration
3.1. Hardware Configuration
Configuration of the serial communication channels for the various operation types as well as serial line termination
for differential communication (RS422/RS485) is accomplished via hardware and software configuration.
The four serial I/O channels are independent and can be configured individually for RS232, RS422 or RS485 serial
communication through setting an 8-port DIP switch, resistor assembly or jumper assembly.
Serial Mode Configuration 3.1.1.
The CP347 offers the possibility to configure each channel’s operation mode with either a per default mounted eight-
port DIP switch (SW1) or with eight 0
Ω
resistors (R16- R23). Because the switches are implemented as GND switches,
and the DIP switch and the resistor option are wired OR, it is possible to use both options. A switch that is ‘On’ or a
resistor that is ‘Set’, always has the higher priority. Two dedicated switches or resistors are necessary to configure
one channel.
Figure 4: 8-port DIP Switch (Default Position – Switches OFF)
The following table shows the possible settings where switch setting are either ‘On’ or ‘Off’ and resistor setting are
either ‘Open’ or ‘Set’.
Table 7: Serial Mode DIP Switch CP347 Configuration
Channel# Channel 0 Channel 1 Channel 2 Channel 3
Switch #/ Resistor 1 / R23 2 / R22 3 / R21 4 / R20 5 / R19 6 / R18 7 / R17 8 / R16
RS232 (default) Off/Open Off/Open Off/Open Off/Open Off/Open Off/Open Off/Open Off/Open
RS422 (4-wire) Off/Open On/Set Off/Open On/Set Off/Open On/Set Off/Open On/Set
RS485 (2-wire)
with local echo On/Set Off/Open On/Set Off/Open On/Set Off/Open On/Set Off/Open
RS485 (2-wire)
without local echo On/Set On/Set On/Set On/Set On/Set On/Set On/Set On/Set
RS422/RS485 Termination Jumpers 3.1.2.
Two 120
Ω
termination resistors per serial channel can be used to terminate the differential line pairs in case the
serial channel is a beginning or end node of a RS422/RS485 network. To enable the 120
Ω
resistors set the respective
solder-jumper (JP1-JP8), by means of connecting the jumper pad with a tin bridge or adding a 0
Ω
resistor.
Table 8: RS422/RS485 Termination Jumper Settings
Mode Channel 0 Channel 1 Channel 2 Channel 3 RS422/485 Mode Options
Full duplex JP7 JP6 JP3 JP2
120
Ω
termination between TxD+ and TxD-
lines enabled
JP8 JP5 JP4 JP1 120
Ω
termination between RxD+ and RxD-
lines enabled
Half duplex JP7 JP6 JP3 JP2 120
Ω
termination between TRxD+ and TRxD-
lines enabled