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# modbus_rtu_set_rts_delay
## Name
modbus_rtu_set_rts_delay - set the RTS delay in RTU
## Synopsis
```c
int modbus_rtu_set_rts_delay(modbus_t *ctx, int us);
```
## Description
The `modbus_rtu_set_rts_delay()` function shall set the Request To Send delay
period of the libmodbus context 'ctx'.
This function can only be used with a context using a RTU backend.
## Return value
The `modbus_rtu_set_rts_delay()` function shall return 0 if successful.
Otherwise it shall return -1 and set errno.
## Errors
- *EINVAL*, the libmodbus backend is not RTU or a negative delay was specified.
## See also
- [modbus_rtu_get_rts_delay](modbus_rtu_get_rts_delay.md)
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