Disconnection Between Master- And Slave-Interface; Internal Memory For The Data-Transfer - Siemens 7XV5550-0xA00 Series Manual

REMOTE>Connected to port # 3
To deselect type BYE
All Master-interfaces are routed to the selected Slave-interface, e.g. the
Active Mini-Starcoupler transforms baudrate and data frame according
the settings for those interfaces. Only one active connection can be
opened at the same time. All other Slave-interfaces are not connected
and in an passive mode. Received datas at the Master-interface are
send only to all other connected Master-interfaces and the selected
Slave-interface.
After the Ative Transmission Mode is activated the operational software
e.g. DIGSI is started on the PC. This software exchange serial datas
between the PC and the serial interface of a device, which has been
connected to the Slave-interface of the Active Mini-Starcoupler. This
data transfer runs via the Master- and Slave-interface of the Active Mini-
Starcoupler, where it transforms the serial datas.
After the PC software application is finished, the connection between
Master- and Slave-interface should be terminated. This can be done by
the software, if the disconnection string is implemented in the software
(e.g. DIGSI 3). If not, it can be done again with the terminal program.
A timeout set for the interfaces also leads to an automatic release of the
Active Transmission Mode. If within the timeout duration no datas are
exchanged Master- and Slave-interface get disconnected.
1.1.9

Disconnection between Master- and Slave-interface

After the entry of ´BYE´ (without RETURN) after approx. 2 s the actual
selected Slave-port is disconnected from the Master-interface. The
Active Mini-Starcoupler switches from the Active Transmission Mode into
the normal operation mode, where it waits for new commands. Because
all Master-interfaces hear the ´BYE´ command, if several Mini-
Starcouplers are cascaded together e.g. via their RS485 interface, they
know that they must be ready now for new channel selection commands.
1.1.10

Internal memory for the data-transfer

The data-transfer between the interfaces of an Active Mini-Starcoupler
runs in full-duplex mode. If serveral devices are cascaded via the RS485
interface it works only half-duplex. Because different baud rates and
data formats can be set for the interfaces, it takes different time to
transmit and receive datas from there. So an uninterrupted data transfer
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