510. Accessories and Options ........................................................ 4710.1 Ribbon Cassettes ...............................................................................4710.2 Option PC Interface .............................................................................4711. Maintenance ......................................................................... 4711.1 Emergency Drawer Opening .................................................................4711.2 Information on the Electromagnetic Compatibility and Safety ...................4712. Character Code Charts ........................................................... 4813. Peripheral Devices ................................................................. 4913.1 Activation of a Serial Interface RS 232 ...................................................4913.2 Cash Register Network Illustration ........................................................5013.3 Cables...............................................................................................5113.3.1 PC-Cable ............................................................................................................. 5113.3.2 Printer-Cable ........................................................................................................ 5114. Error Messages ..................................................................... 5215. Test Routines........................................................................ 5316. Contrast Setting at 16-line-display ............................................ 55