Network Configurations
© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002) 5-37
5.2.3 Multidrop Line, 2-Wire Half-duplex (RS485 Interface)
Fig. 5-12 shows a configuration for a multidrop line, 2-wire half-duplex.
The MD2 modems on the outer left and right represent 2-wire terminal points, the
MD2 modem in the middle is a 2-wire tapping point. All three modems are set to
the "With RS485 interface" operating mode.
All available baud rates and character recognition methods except for "MID off" can
be used in this configuration.
The DIL switch settings on the MD2 modem and the switch settings on the LTOP1
are the same at both terminal points (see Table 5-25). The tapping point requires
other switch settings on the MD2 and LTOP2 (see Table 5-26).
Fig. 5-12 Network configuration: Multidrop line, 2-wire half-duplex (RS485 interface)
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