Network Configurations
6NH7811-0AA22 © Siemens AG 2002 All Rights Reserved
5-46 MD2 Modem (07/2002)
5.2.6 Repeater, 2-Wire Half-duplex (RS485 Interface)
Overview
Fig. 5-15 shows a configuration for a multidrop line with intermediate 2-wire
repeater, 2-wire half-duplex. The MD2 modem on the left represents a 2-wire
terminal point, the MD2 modem on the right is a 2-wire tapping point. Both modems
are set to the "With RS485 interface" operating mode. Both MD2 modems in the
middle form a 2-wire repeater and are set to the "Repeater" operating mode.
All available baud rates and character recognition methods except for "MID off" can
be used in this configuration.
Note that the DIL switch settings for the modems are different due to their location
in the multidrop line: one is a 2-wire terminal point (see Table 5-31), one is a 2-wire
tapping point (see Table 5-32) and two are 2-wire repeaters (see Table 5-33). The
two repeater modems have the same DIL switch settings.
Fig. 5-15 Network configuration: Repeater, 2-wire half-duplex (RS485 interface)
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