1MRS750881-MUM REC 52383Remote Monitoring and Control UnitTechnical Reference Manual11. Revision history of REC 52311.1. Revision identificationThe main releases of REC 523 are differentiated with the software revision letter inthe order number of the device printed on the marking strip on the front panel ofREC 523, for example as follows:Order No: REC523F 033AAAThe revisions of REC 523 are presented in Table 11.1.-1.The revision letter determines the main release which may involve functionaladditions and changes to the product. The changes included in each revisioncompared to the previous one are described in more detail below.11.2. Changes and additions to earlier released revisions11.2.1. Release Q1/99Generalï Software revision B (release 1.5)Protocols and communicationï New protocols:IEC 60870-5-101 (unbalanced mode)DNP 3.0ï ANSI X.3.28 HD not includedHardware and mechanicsï Revision of the CPU card11.2.2. Release Q2/99Generalï Software revision Cï Revision (E) of the disturbance recorder function block MEDREC16ï New features:ï LED testTable 11.1.-1 REC 523 software revisionsRevision ReleaseA Q4/98B Q1/99aa. Includes the same function blocks as Release Q4/98.C Q2/99D Q4/00E Q1/04F Q1/05
