On the GM10, the main module's 7 segment LED displays the contents of errors.
When E5 and 03 alternate, this means error code E503, indicating that that the SD card was not recognized. For corrective action, see section 5.2, >Troubleshooting> in the user's manual (IM 04L55B01-01EN).
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Modular GM10
SMARTDAC+TM GM10 data logger has a modular architecture that can acquire necessary data. By supporting not only I/O but also many communication protocols such as 920MHz wireless, Modbus and so on. Monitor and setting changes are available through Bluetooth. Supporting FDA 21 CFR Part11 and AMS2750E/NADCAP.