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MC35i Terminal Hardware Interface Description

Confidential / Released

MC35i_T_HD_v02.00a Page 23 of 42 16.02.2007

3.5.2 RS-232 interface

Via RS-232 interface, the host controller controls the MC35i Terminal and transports data.

Figure 5: Pin assignment RS-232 (D-Sub 9-pole female)

Table 11: 9-pole D-Sub (female) RS-232

Pin no. Signal name I/O Function

1 /DCD O Data Carrier Detected

2 /RXD O Receive Data

3 /TXD I Transmit Data

4 /DTR I Data Terminal Ready

Attention: The ignition of MC35i Terminal is activated via a

rising edge of high potential (+3 ... +15 V)

5 GND - Ground

6 /DSR O Data Set Ready

7 /RTS I Request To Send

8 /CTS O Clear To Send

9 /RI O Ring Indication

MC35i Terminal is designed for use as a DCE. Based on the conventions for DCE-DTE

connections it communicates with the customer application (DTE) using the following

signals:

• Port TxD @ application sends data to TXD of MC35i Terminal

• Port RxD @ application receives data from RXD of MC35i Terminal

The RS-232 interface is implemented as a serial asynchronous transmitter and receiver

conforming to ITU-T V.24 Interchange Circuits DCE. It is configured for 8 data bits, no parity

and 1 stop bit, and can be operated at bit rates from 300bps to 115kbps. Autobauding

supports bit rates from 4.8kbps to 115kbps. Hardware handshake using the /RTS and /CTS

signals and XON/XOFF software flow control are supported.

In addition, the modem control signals /DTR

, /DSR, /DCD and /RING are available. The

modem control signal RING (Ring Indication) can be used to indicate, to the cellular device

application, that a call or Unsolicited Result Code (URC) is received. There are different

modes of operation, which can be set with AT commands.

Note: The /DTR signal will only be polled once per second from the internal firmware of

MC35i.

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