---
title: PD_RS232_S_DTR
framework: serialdriverkit
role: symbol
role_heading: Macro
path: serialdriverkit/pd_rs232_s_dtr
---

# PD_RS232_S_DTR

The data-terminal-ready signal.

## Declaration

```occ
#define PD_RS232_S_DTR
```

## See Also

### Control Bits

- [PD_RS232_S_DSR](serialdriverkit/pd_rs232_s_dsr.md)
- [PD_RS232_S_RTS](serialdriverkit/pd_rs232_s_rts.md)
- [PD_RS232_S_CTS](serialdriverkit/pd_rs232_s_cts.md)
- [PD_RS232_S_RXO](serialdriverkit/pd_rs232_s_rxo.md)
- [PD_RS232_S_TXO](serialdriverkit/pd_rs232_s_txo.md)
- [PD_RS232_S_DCD](serialdriverkit/pd_rs232_s_dcd.md)