PRS-7910
18 PRS-7910
6.6 Optional Ports
The correct serial port wiring is shown in the following figure. Generally, a foiled cable with at least
two pairs of twisted pairs shall be applied. One pair of the twisted pairs are respectively used to
connect the transmission and reception terminals. The other pair of twisted pairs is used to
connect the signal reference "SGND" of the communication interface. If there is a free terminal or
a grounding terminal "FGND" for all the communication ports, it is suggested to connect the foiled
layer of the cable when connecting multiple devices in series. The foiled layer connection of the
cable shall be grounded at only one end.
Figure 6.6.1 Serial port wiring (MDM module)
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