2.1.10 Setting Resistors Serial Interfaces
There are three multi-pin connectors for the serial interfaces when used in RS485 mode. To get the
lowest current consumption and no negative impacts when COM1(P5) or COM2(P4) are in the
RS232 mode all respective jumpers must be open. COM1 and COM2 are adjustable by firmware
between RS232 and RS485 (ref. to chap.
Baudrate setting). COM3 is always in the operation
mode RS485-2w (half-duplex).
To change or check the position of the jumpers it is necessary to remove the front plate (see
show the position of the multi-pin connectors:
COM1:
10-pin connecter P5 (above the 9 pin D-plug)
COM2:
10-pin connecter P4 (above clamp 20)
COM3:
6-pin connector P3 (above clamp 15)
Termination
COM1(P5) COM2(P4)
COM3(P3)
1000
Ω
pull-down resistor
J7-8 connected
J3-4 connected
1000
Ω
pull-up resistor
J9-10 connected
J5-6 connected
220
Ω
termination resistor
J5-6 connected
J1-2 connected
T+/T- connected to R+/R- for 2 wire operation
(RS485-2w) (Remark: mode not available)
J1-2 and J3-4 connected
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Table 3: Serial Port RS485 termination selection
Figure 13: Jumper for serial interfaces
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