Specifications

Cinterion
®
EXS62-W/EXS82-W Hardware Interface Description
2.1 Application Interface
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t EXS62-W_EXS82-W_HID_v01.200ee 2022-09-07
Public/ Released
Page 29 of 144
2.1.5 Serial Interface ASC1
EXSx2-W 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). For electrical characteristics please refer to Table 2. For an illustration of the
interface line’s startup behavior see Figure 10.
EXSx2-W 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 9: Serial interface ASC1
Features
• Includes only the data lines TXD1 and RXD1 plus RTS1 and CTS1 for hardware hand-
shake.
• Configured for 8 data bits, no parity and 1 or 2 stop bits.
• ASC1 can be operated at fixed bit rates from 300bps to 921,600bps.
• Supports RTS1/CTS1 hardware flow as a configuration option (see [1]). The hardware hand
shake line RTS0 has an internal pull down resistor causing a low level signal, if the line is
not used and open. Although hardware flow control is recommended, this allows communi-
cation by using only RXD and TXD lines.