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- modbus_rtu_set_custom_rts(3)
- ============================
- NAME
- ----
- modbus_rtu_set_custom_rts - set a function to be used for custom RTS implementation
- SYNOPSIS
- --------
- *int modbus_rtu_set_custom_rts(modbus_t *'ctx', void (*'set_rts') (modbus_t *ctx, int on))*
- DESCRIPTION
- -----------
- The _modbus_rtu_set_custom_rts()_ function shall set a custom function to be
- called when the RTS pin is to be set before and after a transmission. By default
- this is set to an internal function that toggles the RTS pin using an ioctl
- call.
- Note that this function adheres to the RTS mode, the values MODBUS_RTU_RTS_UP or
- MODBUS_RTU_RTS_DOWN must be used for the function to be called.
- This function can only be used with a context using a RTU backend.
- RETURN VALUE
- ------------
- The _modbus_rtu_set_custom_rts()_ function shall return 0 if successful.
- Otherwise it shall return -1 and set errno to one of the values defined below.
- ERRORS
- ------
- *EINVAL*::
- The libmodbus backend is not RTU.
- AUTHORS
- -------
- Jimmy Bergström <jimmy@ekontroll.com>
- The libmodbus documentation was written by Stéphane Raimbault
- <stephane.raimbault@gmail.com>
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