Setting Resistors Serial Interfaces - Thies CLIMA DLx-MET Instructions For Use Manual

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. 3.1 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
Figure 5, ref. to chap. 2.1.8). Figure 13 show the position of the multi-pin connectors:
COM1:
COM2:
COM3:
Termination
1000 Ω pull-down resistor
1000 Ω pull-up resistor
220 Ω termination resistor
T+/T- connected to R+/R- for 2 wire operation
(RS485-2w) (Remark: mode not available)
10-pin connecter P5 (above the 9 pin D-plug)
10-pin connecter P4 (above clamp 20)
6-pin connector P3
Table 3: Serial Port RS485 termination selection
Figure 13: Jumper for serial interfaces
(above clamp 15)
COM1(P5)
J7-8 connected
J9-10 connected
J5-6 connected
J1-2 and J3-4 connected
17 - 56
COM2(P4) COM3(P3)
J3-4 connected
J5-6 connected
J1-2 connected
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