2) Attention:When installing the reader, make sure the tab connector (as shown) is professionallygrounded with a flexible line with at least 0.75 mm² (0.11 inch²) (18 gauge) cross section.3.2 Pin AssignmentThe TSU 200 has an M12 connector (male) with 4 pins. Pin assignment is as follows:PIN Description1 +Vcc2 RS485-A3 GND4 RS485-BBecause of the line resistance, certain cable lengths should not be exceeded. The datawires 485-A and 485-B should be twisted together, particularly when using long cables(twisted pair cable). See examples on next page.8 Zulassung_wi_en_ts_tsu-200_pro_v140205_te_bfConnect the earth cable here afterinstalling the earth terminalprovided.