Technical data

Configuration software for SINAUT ST7
1.6 Configuring networks and network nodes in STEP 7 / NetPro
Software
54 System Manual, 07/2009, C79000-G8976-C222-07
The following parameters are available:
● The
Operating mode list box in the Mode area with the options:
– Polling (dedicated lines only):
In polling mode that is used with dedicated lines, the data exchange is is controlled by
the master TIM. This polls the connected stations and node stations one after the
other. Stations with data to transmit send it as soon as they are polled. Stations that
do not currently have any data acknowledge the poll. Only data to be sent from the
master TIM to the stations can be transferred at any time between two individual polls.
– Polling with time slots (dedicated lines only):
This mode differs from the polling mode because time slots are defined in which the
polls take place. Each minute is divided into a selectable number of time slots. When
using external wireless networks, the number of time slots per minute is generally
prescribed by the relevant regulatory bodies. You configure the time slots to be used
in the
Time Slots tab.
– Multi-master polling with time slots (dedicated lines are only):
In this mode, the polls originate from several masters, once again in time slots. Here,
various masters can be assigned different time slots for their polling.
Multi-master polling with time slots is available only for ST7 networks with the FT2
message format with long acknowledgment. You configure the time slots in the
Time
Slots
tab.
– Spontaneous (dial-up networks only):
Spontaneous mode is intended for data exchange in the public telephone network, the
ISDN network, or the GSM network. Only the TIM with an important data change
transfers its data spontaneously and waits for an acknowledgment from the partner.
Prior to the actual data transfer, the TIM must first establish a dial-up connection to the
partner. Following successful transmission of the data, the TIM waits for the
acknowledgment. Following this, the dial-up connection is terminated immediately
again if the partner does not use the existing connection to transfer any existing data.
In the
Message parameters area, you can set the following parameters:
●
Message format :
The message format corresponds to IEC 870-5-1. The selection FT1.2 or FT2 depends
on the modem. The standard modems MD2 - MD4 can handle both message formats, the
GSM modules M20, TC35 and MC45 only FT2.
Default: FT1.2
– FT1.2 (8E1):
Character format 8 data bits,
even parity, 1 start bit, 1 stop bit
Modem setting: Data format 11 bits
– FT2 (8N1):
Character format 8 data bits,
no parity, 1 start bit, 1 stop bit
Modem setting: Data format 10 bits
Note
For more detailed information on setting the message format, refer to the section on
installing and putting a SINAUT modem into operation in the description of the
displays and the connectors accessible from above.