Operating Modes and Character Recognition
6NH7811-0AA22 © Siemens AG 2002 All Rights Reserved
4-6 MD2 Modem (07/2002)
4.1.3 "Repeater" Operating Mode
The "Repeater" operating mode is used to build repeaters. Two MD2 modems are
needed to form a repeater. They are connected to one another via the RS232
interface by the standard cable 6NH7701-1CB. Both modems must be set to the
"Repeater" operating mode.
The repeater is used to increase the range for data transmission between to
terminal points. The repeater regenerates the received signal so after the repeater
the maximum range for data transmission for the baud rate set is available once
again. The repeater can be located anywhere on the dedicated line. There is no
limit to the number of repeaters that can be used in a network configuration. It is
possible to use repeaters in point-to-point, multidrop and star networks (see
sections 5.1.8 and 5.1.9).
Note
Note that the message running time on the transmission line is increased by 4
bits per repeater.
The "Repeater" 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 "Repeater" operating mode.
Fig. 4-3 DIL switch setting for the
"Repeater" operating mode
123 4
OFF
ON
5678 910
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