Gemalto M2M GmbH EMS31-X Manuel D’Utilisation
Cinterion
®
EMS31-X Hardware Interface Description
2.1 Application Interface
18
EMS31_US_HIO_v00.001
2018-09-21
Confidential / Preliminary
Page 10 of 33
2.1.2
Serial Interface ASC1
EMS31-X provides a 4-wire unbalanced, asynchronous modem interface ASC1 conforming 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).
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).
EMS31-X 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:
•
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 3:
Serial interface ASC1
Features
•
•
Includes only the data lines TXD1 and RXD1 plus RTS1 and CTS1 for hardware hand-
shake.
shake.
•
On ASC1 no RING line is available. However, RING0 line can be software configured for
URC signalization via ASC1 (see
URC signalization via ASC1 (see
).
•
Configured for 8 data bits, no parity and 1 or 2 stop bits.
•
ASC1 can be operated at fixed bit rates from 1,200 bps to 3,686,400bps.
•
Supports RTS1/CTS1 hardware flow control. Communication is possible only by respecting
hardware flow control. Otherwise, the module might disregard some data transmitted from
host. In case of quitting CTS1 line, only one character can be sent from the host application
to the module through TXD1 line
hardware flow control. Otherwise, the module might disregard some data transmitted from
host. In case of quitting CTS1 line, only one character can be sent from the host application
to the module through TXD1 line
•
Wake up from SLEEP mode by RTS1 activation.
TXD1
RXD1
RTS1
CTS1
TXD
RXD
RTS
CTS
Module (DCE)
Application (DCE)