
Installation 2
2 - 9
Modem to I/O Plexer - RS-232
Figure 2-10 link via modem
Two handshake control lines are provided on the I/O PLEXER for interfacing to
modems. They are request to send (RTS) and Clear to send (CTS). An active
high RTS signal from the I/O PLEXER advises the modem that data is available.
When the modem is ready to accept data, it places its CTS line active high to the
I/O PLEXER thus initiating the data exchange.
In addition to the modem to I/O PLEXER wiring the installer should confirm that
JP3 (RTS/CTS Jumper) is positioned as shown in figure 2-10. Jumper JP5
(RTS/CTS for the local RS-232 port), should remain in the horizontal position
unless the RTS/CTS pair is needed in the device connected to the local RS-232
port. A cable for most modem applications, the IOP-RT cable, is available from
duTec.
The switches marked “Pull up” in figure 2-5 should be left in the “on” position.
Note:
If the modem must make use of the RTS/CTS hardware
handshake, only one I/O PLEXER can be used per modem.
If more than one I/O PLEXER is used at a given remote site,
care should be taken that the modem does not need the
RTS/CTS handshaking or external hardware will be
required.
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