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SERIAL CURRENT LOOP INTERFACE RS232, RS485 AND 20-MA-ES FOR VARIOGRAPH 7ND3521, 7ND3560 AND 7ND3590 WITH ZERO-MODEM CABLE, FROM FIRMWARE STATUS 08 ONWARDS (CAN BE RE- CALLED IN STATUS MENU OF RECOR- DER), UP-DATING OF THE FIRMWARE TO 7.5 POSSIBLE, SE
