2N Analogue GSM gateway 2N EasyGate PRO - Manual, 1749 v1.03 - Manual (Page 56)

Data connection using USB port 4.4
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4.4 Data connection using USB port
EasyGate device is equipped with virtual serial port that simulates standard COM port
in PC according to specification RS-232C. Installation is described in section 3.1
paragraph „Installation and setting of EasyGate PCManager“ points 1 to 3.
The transmission rate ranges from 1200 to 115200 bps (EasyGate supports
autobauding, i.e. responds to an AT command at a rate identical with the AT command
transmission rate, and retains set on this rate). The transmission setup must be 8 bits,
no parity and one STOP bit (8N1).
During the call establishing and terminating the serial interface of GSM module is used
by the central processor of EasyGate. During this time periods the communication with
module is impossible. The communication is blocked by setting of the signals for flow
control on virtual COM port. All PC SW must provide transmission hardware flow
control (HW handshaking).
CSD PC-PC Data Transmission
The CSD mode provides data transmission in the GSM network at the maximum
transmission rate of 14400 bps. It works like a classic connection of two modems (AT
commands ATD, ATH, ATA, etc.). Connection can be made with another GSM modem
or a PSTN modem. In UMTS network CSD connection usually is not supported.
Caution
n Data calls and fax calls from the PSTN come as voice calls (the telephone
line on EasyGate rings) because an analog network is unable to distinguish
a modem/fax call. Therefore, it is necessary to have a special telephone
number for incoming data and fax calls on the SIM card different from
voice call numbers (Multi-numbering scheme). The GSM network identifies
a call incoming to this number as a data/fax call and lets the COM serial
interface ring.
Internet Data Connection
GSM version of Easy Gate is equipped by GSM module Cinterion MC55i-w. This module
supports data connection GPRS, the maximal speed is 85,6 kbps (download). This
connection is suitable for smaller amount of data transmit or the occasional access to
internet.
UMTS version of Easy Gate is equipped by UMTS module Simcom SIM5320E
(SIM5320A or SIM5320J for non-European versions). This module supports data
connection GPRS, EDGE, WCDMA and HSDPA, the maximal speed is 3,6 Mbps
(download). When the HSPA technology is accessible in the place, the gateway can be
used for standard connection of PC to internet.