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C) SERIAL CABLE NOT COMPLETED
In case your application (eg. PLC) supports only TD and RD signals (Trasmission and
Reception), it is however possible to connect it to the GSM Bulk. In this case you will use a
non-completed serial cable; for this reason it is important to configure GSM Bulk so that it
ignores the serial criteria not present. Usually GSM Bulk, during the communication phase,
checks the following criteria: 108 (Data Terminal Ready) and 105 (Request To Send): to
disable them use the commands AT&D and AT+IFC.
Examples:
Command: AT&D0
Command: AT&D2
Answer:
OK
Command: AT+IFC=0,0
Command: AT+IFC=2,2
Answer:
OK
D) DATA TRANSFER
GSM Bulk can call and be called by analog (PSTN), digital (ISDN) and GSM devices.
Usually DATA connections with analog modems are at 9600bit/s (V.32 protocol); ISDN
connections use V.110 protocol with speed at 9600bit/s. The data transfer with another
GSM device is carried out using V.32 or V.110 protocols.
DATA Calls
Using the ATD command it is possible to make a call. For example, to call the number
0123456789 you must send to the modem the command ATD0123456789<Enter>.
Depending on the AT+CBST command setting it is possible to program GSM Bulk for
analog, digital or GSM calls:
AT+CBST=0,0,1
connection with analog or GSM modems in multistandard (V.32)
AT+CBST=7,0,1
connection with analog or GSM modems only in V.32 at 9600bit/s
AT+CBST=71,0,1 connection with digital or GSM modem only in V.110 at 9600bit/s
Attention: check with your telephone operator if your SIM is enabled for DATA
and eventually for FAX. In fact most SIMs are enabled for Voice (call and
reception) while for DATA and FAX only the call is enabled.
To enable the reception of DATA and FAX traffic it is necessary to ask the
telephone operator that will assign two additional numbers (one to receive
DATA calls and one to receive FAX calls).
(Criterion 108 ignored)
(Criterion 108 managed as per specification)
(Criterion 105 ignored: flow control OFF)
(Criterion 105 managed as per specification: flow control ON)
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