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modbus_rtu_get_rts

Name

modbus_rtu_get_rts - get the current RTS mode in RTU

Synopsis

int modbus_rtu_get_rts(modbus_t *ctx);

Description

The modbus_rtu_get_rts() function shall get the current Request To Send mode of the libmodbus context ctx. The possible returned values are:

  • MODBUS_RTU_RTS_NONE
  • MODBUS_RTU_RTS_UP
  • MODBUS_RTU_RTS_DOWN

This function can only be used with a context using a RTU backend.

Return value

The function shall return the current RTS mode 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.

See also