LDM41A and LDM42A Manual Interface Connection
ASTECH GmbH Page 41
9 Interface Connection
The LDM41A and LDM42A provide one serial port type RS232 or
RS232 depending on the version (see label). For devices with RS232,
the RS232 transmission lines (TX +, TX-) are also available.
9.1 Serial Interface RS232
Initially, RS232 communication interfaces purely functioned as PC
communication ports. They have become the established standard tool for
serial data transmission over short cable lengths. With greater transmission
lengths, the interface is highly susceptible to interferences, notably, in the
vicinity of strong electromagnetic noise emitters.
Therefore, it should only be used for LDM41A and LDM42A configuration.
Figure 15 : Diagram of RS232 wiring at 9-position D-Sub cable jack
Figure 16 : Diagram of RS232 wiring at 25-pole D-Sub cable jack
The commands of the serial interface are described in chapter 8 starting page
24. The data output format is determined by parameter SD (display format),
see page 30.
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