Electrical Connection LDM41A and LDM42A Manual
Page 20 ASTECH GmbH
5.4 Termination of RS232
RxD and TxD data lines should be kept as short as possible in all cases, because
they tend to have an interference emitting and interference receiving effect,
notably, when in open state. Especially in environments with strong spurious
radiation there may be faults that may in some cases require a reset (turning
the LDM41A and LDM41A off and on again). In cases where no RS232 interface
communication is required after parameterization, you should provide for a
termination wiring as shown in Figure 9.
Make sure you leave no data line end opne. It
will be highly sensitive to interferences (EMC).
A terminator circuit should be installed when
the RS232 is unconnected. This circuit must be
provided by the customer (see diagram on the
left)
Please keep the RS232 norm. The maximal cable length of the RS232 is 15 m.
Use alternatively a RS232 connection (use shielded twisted pair cable,
maximum 300 m, termination resistor 100 Ω).
Figure 9 : Recommended
terminations wiring for work
with open RS-232
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