Specifications

CINTERION
®
BGS12 Hardware Interface Description
Contents
46 of 109
Page
BGS12 HID_V00.915
Confidential / Released
2019
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01
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07
3.9 Serial Interface ASC1
BGS12 offers a 2-wire unbalanced, asynchronous modem interface ASC1 conforming to ITU-
T V.24 protocol DCE signalling. The electrical characteristics do not comply with ITUT V.28.
The electrical level of the ASC1 interface is set to 2.8V. For electrical characteristics please
refer to Table 20.
BGS12 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
Figure 17: Serial interface ASC1
Features
•
Includes only the data lines TXD1 and RXD1.
•
For firmware upgrading and tracing purpose.
•
Configured for 8 data bits, no parity and 1 or 2 stop bits.
•
ASC1 can be operated at fixed bit rate at 921,600 bps. Autobauding is not supported on
ASC1.
Table 13: DCE-DTE wiring of ASC1
V.24 circuit
DCE DTE
Line function Signal direction Line function Signal direction
103 TXD1 Input TXD Output
104 RXD1 Output RXD Input
The following figure shows the startup behavior of the asynchronous serial interface ASC1.