TRM-710.200T

Serial TETRA Radio Station

The TRM-710.200T/Z Radio Modem is intended for use as master station in a TETRA radio network. Data received by the TRM-710.200T/Z via its serial interface is converted to TETRA frames and transmitted through the radio packet switching system to a TRM-710 (slave radio modem) or RTU-710 (radio RTU with I/Os). The slave TRM-710 reconverts the data into its original format (e.g., MODBUS or IEC 60870-5-101) before sending it out via its serial port, while the RTU-710 responds by reporting input states and values or setting outputs as commanded.

Protocol conversion is done by the radio modems (master and slave) in both directions (TETRA <-> serial). Serial protocols supported are: MODBUS-RTU, IEC 60870-5-101, and user-configurable data-blocks, while 3964R and Timeout protocols are supported at the link level (OSI Layer 2).

Operation: Data received by the master station via its serial interface is transmitted using TETRA packet switched SDS (Short Data Service) to the target radio module. If the data to be sent exceeds the SDS limit of 120 or 140 characters, it is broken up by the sending station into sub-frames, and reassembled by the receiving station into its original composition.