Funk-Electronic Piciorgros GmbH
TGW-100/TGW-100R
V2.71 - Page 40 of 59
3.1.5
Use of the TGW-100 as master gateway
A Routing Table must be loaded into the TGW-100 when it is designated as a master
device. Up to 1024 ISSI and IP addresses can be registered. Each of the ISSI or IP
address in the Routing Table is assigned to a logical address in sequential order,
corresponding to the addresses used by the serial data communication protocol.
The Routing table can be set up using the embedded web server.
The TGW-100 is configured (user setting) for the specific serial data communication
protocol to be used. Any of the commonly used protocols can be selected, e.g.,
MODBUS, IEC-60870, Pakbus, ROC, BSAP or DNP3. Customized (non-standard)
protocols may also be used because the position of the address byte and its length (1 or 2
bytes) are also user-programmable.
Protocol Configuration
When a data block is received at the serial interface of the TGW-100, it waits for the
complete data block to be received. The data block end criterion is that no further data
byte is received after a lapse of a user-programmed time (default: 10 milliseconds). The
protocol-dependent logical address of the destination terminal equipment is extracted
from the data received via the serial interface. Using this, the ISSI or IP address of the
target modem is looked up from the Routing Table, added to the data block, and
transmitted over the TETRA network.
If a broadcast address is reserved in the serial data communication protocol (e.g.,
MODBUS-RTU), a corresponding GISSI (Group ISSI address) included in the routing
table. Therefore broadcast can be supported, whereby a data block can be sent
simultaneously to several modems on the same TETRA network. Broadcast is only
supported with SDS based communication, as most TETRA networks do not support IP
broadcasting in their networks.
