2N SmartGate - User Manual - Manual (Page 20)

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7. COM – Serial Interface
The complete serial interface RS-232C on a 9-pin connector is identical with any
external modem.
The transmission rate ranges from 1200 to 115200 bps (SmartGate 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).
SmartGate’s central processor uses the same interface for establishing calls and so it
must have the possibility to block an external serial interface-all PC SW must provide
transmission hardware flow control (HW handshaking).
COM can be used for:
· Programming and monitoring;
· CSD PC-PC data transmission;
· PC-FAX-transmission of fax messages from your PC;
· CSD or high-speed GPRS connection to the Internet;
· SMS sending and receiving.
7.1. Programming, Monitoring
Install the SmartGate PCManager software available on the included CD-ROM into
your PC.
The program is designed for SmartGate parameters programming. It can read
configuration data from the memory and store them in SmartGate. Moreover, all
parameters can be saved in your PC file for backup or saving into another SmartGate
system.
The SmartGate PCManager contains an easy monitoring tool too. With this tool you
can identify the GSM provider’s name, signal strength, GSM module, SIM card, and so
on during SmartGate operation.
7.2. 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.
Caution! Data calls and fax calls from the PSTN come as voice calls (the telephone
line on SmartGate 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.