User's Manual

Cinterion
®
Java Terminals Hardware Interface Overview
3.4 RS-232 Interface
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 EHSxT_BGS5T_HIO_v02 2015-02-10
Confidential / Released
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3.4 RS-232 Interface
The RS-232 interface is not available for EHS5T RS485. The interface is implemented as a se-
rial 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
1200bps to 921kbps. Autobauding supports bit rates from 1.2kbps to 230kbps.
For more information see also Section 3.4.1.
3.4.1 9-Pole D-sub Connector
Via RS-232 interface, the host controller controls the Java Terminals and transports data.
Figure 4: Pin assignment RS-232 (D-sub 9-pole female)
Java Terminals are designed for use as a DCE. Based on the conventions for DCE-DTE con-
nections it communicates with the customer application (DTE) using the following signals:
• Port TxD @ application sends data to TXD0 of the Java Terminals
• Port RxD @ application receives data from RXD0 of the Java Terminals
Hardware handshake using the RTS0 and CTS0 signals and XON/XOFF software flow control
are supported.
Table 12: 9-pole D-sub (female) RS-232
Pin no. Signal name I/O Function
1 DCD0 O Data Carrier Detected
2 RXD0 O Receive Data
3 TXD0 I Transmit Data
4 DTR0 I Data Terminal Ready
Attention: The ignition of Java Terminals is activated via a rising
edge of high potential (+3 ... +15 V)
5 GND - Ground
6DSR0
1
1. Note that DSR0 may also be available via GPIO connector pin - see Section 3.6.
O Data Set Ready
7 RTS0 I Request To Send
8 CTS0 O Clear To Send
9 RING0 O Ring Indication
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