Modbus IO board help

Hi everybody!
I have bought an ethernet to RS485 board and an IO board (8 in / 8 out).
With the node Modebus Read (node-red-contrib-modbus) I see that they communicate, but receive only zeros (In the input board the input 1 and 8 are high while the others are low).

The quantity that I can read is 48 (if I put 49, it doesn't read anything) and if I start over 0, it still doesn't read anything, so it seems that the registers are from 0 to 47.

Does anybody know how to read the input and to control the output?

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