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TC35i Terminal Hardware Interface Description

Confidential / Released

TC35i_T_HD_v01.05 Page 21/37 10.07.2003

Table 5: 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 TC35i Terminal is activated via a

rising edge of high potential (+5 ... +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

The current of all signals is limited by serial resistors:

Outputs: 470 Ohm

Inputs: 1kOhm

TC35i 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 TC35i Terminal

· Port RxD @ application receives data from RXD of TC35i 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.

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

of TC35i.

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Siemens TC35i Manuel d'utilisateur Page 21