Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 629)

I/O Commands
Read GPIO value +WIOR
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WM_DEV_OAT_UGD_049 - 001 VOLUME 4 August 23, 2007
22.2.5 Examples
Command Responses
AT+WIOR=1
Note: Reads I/O (number 1) value
+WIOR: 0
OK
Note: GPIO number 1 is reset/low
22.2.6 Notes
By default (e.g. after a reset), the I/O ports configuration is set by the +WIOM
command.