![Siemens TC65 Скачать руководство пользователя страница 47](http://html.mh-extra.com/html/siemens/tc65/tc65_hardware-interface-description_375442047.webp)
TC65 Hardware Interface Description
Strictly confidential / Draft
s
TC65_HD_V00.521
Page 47 of 99
24.05.2005
3.10
Serial Interface ASC1
The ASC1 interface has different functions depending on whether or not Java is running.
Under Java, ASC1 works as System.out as defined in [7], the exact definition can be found
under
java.lang.System.out
. For System.out only the RXD1 line of the TC65 module is
necessary. The function may be used primarily for development purposes. For further detail
also refer to [6].
If Java is not used, the ASC1 interface is available as a 4-wire unbalanced, asynchronous
modem interface ASC1 conforming to ITU-T V.24 protocol DCE signalling. The electrical
characteristics do not comply with ITU-T V.28. The significant levels are 0V (for low data bit
or active state) and 2.9V (for high data bit or inactive state). For electrical characteristics
please refer to Table 17.
TC65 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 module’s TXD1 signal line
•
Port RXD @ application receives data from the module’s RXD1 signal line
GSM module (DCE)
Application (DTE)
TXD
RXD
RTS
CTS
TXD1
RXD1
RTS1
CTS1
Figure 13: Serial interface ASC1 (if Java is not used)
Features
•
Includes only the data lines TXD1 and RXD1 plus RTS1 and CTS1 for hardware
handshake.
•
On ASC1 no RING line is available. The indication of URCs on the second interface
depends on the settings made with the AT^SCFG command. For details refer to [1].
•
Configured for 8 data bits, no parity and 1 or 2 stop bits.
•
ASC1 can be operated at bit rates from 300bps to 460800bps.
•
Autobauding
TBD.
•
Supports RTS1/CTS1 hardware flow control and XON/XOFF software flow control.