Operating Modes and Character Recognition
6NH7811-0AA22 © Siemens AG 2002 All Rights Reserved
4-4 MD2 Modem (07/2002)
The following table provides an overview of the operating modes to be used in
conjunction with the various types of transmission, network configurations and
character recognition methods.
Table 4-1 Overview of various operating modes and network configurations
Transmission type Connection
possible
Operating mode
4-wire full-
duplex
4-wire half-
duplex
2-wire half-
duplex
Point-to-
point
Multidrop
network
Star
network
Character
recognition
possible
Normal x x x x x x All
Normal,
with DTR/RTS on
x x - x - -
Everything
except
"MID off"
Repeater x x x x x x All
RS485 port - - x x x x
Everything
except
"MID off"
Signal refresh x x x x x x
Not
applicable
Note
The test operating modes are not included in Table 4-1 because it is not possible
to create a network configuration with them in which data can be exchanged.
Their only purpose is for testing or checking the functions of the modem.
The following sections contain detailed descriptions of the functions and
applications of the individual MD2 operating modes. A few examples of the various
network configurations and the corresponding settings on the MD2 modem are
available in Chapter 5 Network Configurations.
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