5-76 APPLICATION FUNCTIONS
MON2000
GC DB-9 Serial to External Modem DB-25 JULY 2010
Both of the GC Controller DB-9 jacks are
female and have identical pin assignments.
Figure 5-2 DB-9 Connector and Pinout, P2 and P3
5.18.1 GC DB-9 Serial to External Modem DB-25
To make an RS-232 serial connection between
one of the DB-9 serial ports of the GC, and an
external modem with DB-25 serial port, you
will need to manufacture a cable. The cable will
need DB-9, male, and DB-25, male, plug cable
ends as illustrated in Figure 5-3.
The DB-9 jack on the GC serial port is wired to
appear like a Data Communications
Equipment (DCE). Therefore, you use a custom
A DB-9 male pin numbering
scheme is also illustrated,
but for reference purposes
only.
GC serial ports were wired to appear as DCE so that a
straight-through serial cable could be used, instead of a
null-modem cable, for direct serial connection between
the GC Controller and the PC, which is Data Terminal
Equipment (DTE).