Cinterion
®
Java Terminals Hardware Interface Overview
3.4 RS-232 Interface
39
EHSxT_BGS5T_HIO_v03
2016-05-26
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
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
6
DSR0
1
1. Note that DSR0 may also be available via GPIO connector pin - see
.
O
Data Set Ready
7
RTS0
I
Request To Send
8
CTS0
O
Clear To Send
9
RING0
O
Ring Indication
1
2
3
4
5
6
7
8
9
