PD22 Data Logger/Concentrator

The PD22 data concentrator is destined for telemetering computer systems as an intermediate element in the data exchange between the object side and the master system. The data concentrator speeds up the data exchange between devices and the master system. Moreover it allows to increase the number of devices connected to the system. Two serial ports are used for communication. The first port (Port 1) having two RS-485 interface systems, destined to communicate with devices working in the object. The second port (Port 2) has RS-485, RS-232 and USB interfaces, destined to communicate with the master system through wire links.
An asynchronous MODBUS character communication protocol has been implemented on the serial link. The concentrator has a real time clock.
Parameter set of the concentrator serial link:
– address: 1 … 247
– baud rate: 12 00, 2400, 4800, 9600, 19200, 38400, 57600, 1152 00 bit/s,
– working mode:ASCII, RTU,
– information unit: ASCII: 8N1, 7E1, 7O1, 7N2,
RTU: 8N2, 8E1, 8O1, 8N1

The data concentrator realises following functions:
– readout of process parameters values from devices which are accessible as concentrator parameters,
– archiving of process data with a defined frequency, which are made available on demand for the master system (390000 records),
– archiving of emergency events (44400 events),
– data exchange consisting in transmission of demands from the master system to the specific device, eg. readout or parameter record.