Cinterion
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ALAS5 Hardware Interface Overview
2.1 Application Interface
32
ALAS5_HIO_v00.030a 2019-04-01
Confidential / Preliminary
Page 17 of 50
2.1.2 Serial Interface ASC0
ALAS5 offers an 8-wire (plus GND) unbalanced, asynchronous modem interface ASC0 con-
forming to ITU-T V.24 protocol DCE signaling. The electrical characteristics do not comply with
ITU-T V.28. The significant levels are 0V (for low data bit or active state) and 1.8V (for high data
bit or inactive state).
ALAS5 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 the module’s TXD0 signal line
• Port RXD @ application receives data from the module’s RXD0 signal line
Figure 3: Serial interface ASC0
Features:
• Includes the data lines TXD0 and RXD0, the status lines RTS0 and CTS0, and the modem
control lines DTR0, DSR0, DCD0 and RING0.
• Configured for 8 data bits, no parity and 1 stop bit.
• ASC0 can be operated at fixed bit rates from 115,200 to 921,600bps.
• Supports RTS0/CTS0 hardware flow control.
Note: If the ASC0 serial interface is the application’s only interface, it is suggested to connect
test points on the USB signal lines as a potential tracing possibility.
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