Operating Modes and Character Recognition
© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002)
4-5
4.1.1 "Normal" Operating Mode
The "Normal" operating mode is the standard mode for connecting a DTE to the
modem via the RS232 interface. Standard cable 6NH7701-4DL, is used for
connecting the DTE to the MD2 modem in this case. The data transmission via the
modem is controlled by the DTE through the control signals of the RS232 interface.
The following network configurations can be built using this operating mode:
· Point-to-point connection
· Multidrop network
· Star network
The "Normal" operating mode can be used together with all of the available
character recognition methods and transmission types (see Table 4-1).
The following illustration shows the setting on the 10-pin DIL switch of the MD2 for
the "Normal" operating mode.
Fig. 4-1 DIL switch setting for the
"Normal" operating mode
4.1.2 "Normal" with DTR/RTS on" Operating Mode
Similar to the "Normal" operating mode, the "Normal" with DTR/RTS on" mode is
used to connect a DTE via the RS232 interface. Standard cable 6NH7701-4DL, is
also used for connecting the DTE to the modem. However, this operating mode
allows the connection of data terminal equipment in which the RS232 control
signals DTR and RTS are not available and there is no support for RTS/CTS
handshaking.
Only a point-to-point connection in 4-wire full-duplex or 4-wire half-duplex
transmission mode is possible. It is not possible to build a multidrop network.
The "MID off" character recognition cannot be used (see Table 4-1).
The following illustration shows the setting on the 10-pin DIL switch of the MD2 for
the "Normal with DTR/RTS on" operating mode.
Fig. 4-2 DIL switch setting for the
"Normal with DTR/RTS on" operating mode
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