1MODBUS_RTU_SET_CUSTO(3)        libmodbus Manual        MODBUS_RTU_SET_CUSTO(3)
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NAME

6       modbus_rtu_set_custom_rts - set a function to be used for custom RTS
7       implementation
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SYNOPSIS

10       int modbus_rtu_set_custom_rts(modbus_t *ctx, void (set_rts) (modbus_t
11       ctx, int on))
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DESCRIPTION

14       The modbus_rtu_set_custom_rts() function shall set a custom function to
15       be called when the RTS pin is to be set before and after a
16       transmission. By default this is set to an internal function that
17       toggles the RTS pin using an ioctl call.
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19       Note that this function adheres to the RTS mode, the values
20       MODBUS_RTU_RTS_UP or MODBUS_RTU_RTS_DOWN must be used for the function
21       to be called.
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23       This function can only be used with a context using a RTU backend.
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RETURN VALUE

26       The modbus_rtu_set_custom_rts() function shall return 0 if successful.
27       Otherwise it shall return -1 and set errno to one of the values defined
28       below.
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ERRORS

31       EINVAL
32           The libmodbus backend is not RTU.
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AUTHORS

35       Jimmy Bergström <jimmy@ekontroll.com>
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37       The libmodbus documentation was written by Stéphane Raimbault
38       <stephane.raimbault@gmail.com>
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42libmodbus v3.1.6                  01/19/2023           MODBUS_RTU_SET_CUSTO(3)