User guide

COM – Serial Interface 4.4

4.4 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 (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).

EasyGate’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;

 CSD or high-speed GPRS connection to the Internet;

 SMS sending and receiving.

Programming, Monitoring

Install the EasyGate PCManager software available on the included CD-ROM into your

PC.

The program is designed for EasyGate parameter programming. It can read

configuration data from the memory and store them in EasyGate. Moreover, all

parameters can be saved in your PC file for backup or saving into another EasyGate

system.

The EasyGate PCManager contains an easy monitoring tool too. With this tool you can

identify the GSM provider’s name, signal strength, GSM module, SIM, and so on

during EasyGate operation.

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 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.