Gemalto M2M GmbH EHS6-A 사용자 설명서
Cinterion
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EHS6-A Hardware Interface Overview
Page 14 of 41
2.1 Application Interface
22
EHS6-A_HIO_v02.770
2014-08-13
Confidential / Preliminary
2.1.2
Serial Interface ASC0
EHS6-A offers an 8-wire unbalanced, asynchronous modem interface ASC0 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 1.8V (for high data bit
or inactive state).
or inactive state).
EHS6-A 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
@ 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, in addition,
• Includes the data lines TXD0 and RXD0, the status lines RTS0 and CTS0 and, in addition,
the modem control lines DTR0, DSR0, DCD0 and RING0.
• ASC0 is designed for controlling GSM/UMTS voice calls, transferring data and for
controlling the module with AT commands.
• Full multiplexing capability allows the interface to be partitioned into virtual channels.
• The RING0 signal serves to indicate incoming calls and other types of URCs (Unsolicited
• The RING0 signal serves to indicate incoming calls and other types of URCs (Unsolicited
Result Code). It can also be used to send p ulses to the host application, for example to
wake up the application from power saving state.
wake up the application from power saving state.
• Configured for 8 data bits, no parity and 1 stop bit.
• ASC0 can be operated at fixed bit rates from 1,200bps up to 921,600bps.
• Autobauding supports bit rates from 1,200bps up to 230,400bps.
• Supports RTS0/CTS0 hardware flow control. The hardware hand shake line RTS0 has an
• ASC0 can be operated at fixed bit rates from 1,200bps up to 921,600bps.
• Autobauding supports bit rates from 1,200bps up to 230,400bps.
• Supports RTS0/CTS0 hardware flow control. The hardware hand shake line RTS0 has an
internal pull down resistor causing a low level signal, if t he line is n ot used and open.
Although hardware flow control is recommended, this allows communication by using only
RXD and TXD lines.
Although hardware flow control is recommended, this allows communication by using only
RXD and TXD lines.
• Wake up from SLEEP mode by RTS0 activation (high to low transition).
2.1.3
Serial Interface ASC1
Four EHS6-A GPIO lines can be configured as ASC1 interface signals to provide 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 1.8V (for high data bit or inactive state).
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 1.8V (for high data bit or inactive state).