Siemens ESM - Manual (Page 53)

Interfaces, Displays and Operator Controls
Industrial Ethernet OSM/ESM
C79000-Z8976-C068-10
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4.1.6 Serial Interface
OSM/ESM modules have an RS-232 interface. This is used for the following
purposes:
− Firmware Updates
− Management with the aid of the command line interpreter (CLI) including
setting the IP address information (see /1/).
Pin 5 SG
DSR Pin 6 Pin 1
Pin 4 DTR
Pin 2 RD
Pin 3 TD RTS Pin 7
CTS Pin 8
Pin 9
Figure 23: Pinout