
Firmware Update
Industrial Ethernet OSM/ESM
68
C79000-Z8976-C068-04
Preparations
Connect the serial port of your PC and the OSM/ESM with a normal null modem cable
. Depending on the port of the PC that you are using, you require a cable with a 9-pin
or 25-pin sub-D female connector for the PC end, and a 9-pin female connector for the
OSM/ESM end.
The following table shows the pinout and the connections for both types of cable:
PC port 25-pin
Female
9-pin
Female
connected
to
OSM port 9-pin
Female
Signal Name Pin Pin Pin Signal name
TD (Transmit Data) 2 3 2 RD
RD (Receive Data) 3 2 3 TD
RTS (Request To
Send)
47 8CTS
CTS (Clear To Send) 5 8 7 RTS
SG (Signal Ground) 7 5 5 SG
DSR (Data Set Ready) 6 6 4 DTR
DTR (Data Terminal
Ready)
20 4 6 DSR
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