Mounting and Installation
6NH7811-0AA22 © Siemens AG 2002 All Rights Reserved
2-18 MD2 Modem (07/2002)
2.1.9 DIL Switch for Activating the RS232 or RS485 Port
A 4-pin DIL switch can be accessed from the bottom of the modem housing (see
Fig. 2-6). The DIL switch is used to activate either the RS232 or RS485 interface.
The terminating resistor for the line is also switched on here for the RS485 mode
(see Fig. 2-13). The following illustration shows a summary of the settings possible,
Fig. 2-6 lists the default settings.
Fig. 2-7 Various settings on 4-pin DIL switch for activating RS232/RS485
2.1.10 DIL Switch for Activating Terminating Resistors (WAN)
Another 4-pin DIL switch can be accessed from the bottom of the MD2 housing.
This is used for activating the terminating resistors at the WAN end (see Fig. 2-6
for the location of the DIL switch). Fig. 2-8 is a summary of the various settings,
Table 2-14 lists the respective default settings.
Fig. 2-8 Various settings for terminating resistors at the WAN end
1234
OFF
ON
RS232 active
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