User manual

GSM modem protocol for pCO
2
Carel code +030220330 Rel. 2.0 del 30/10/02
17
INTRODUCTION
Carel’s pCO
2
programmable controllers can now manage the new pCO
2
/GSM protocol which allows them to send and receive
SMS messages, using the GSM modem, for signalling active alarms and resetting them where possible using a GSM mobile
phone.
Furthermore, a pCO
2
can be connected to a remote supervisor even when a traditional telephone line isn’t available. In fact,
all the properties of the pCO
2
/Modem protocol remain valid, allowing interface via modem of the pCO
2
peripherals to a
remote supervisor communicating with Carel standard protocol, without the assistance of a gateway (see
MODEM Protocol
for pCO
2
manual).
1. GENERAL INFORMATION ON THE pCO
2
/GSM PROTOCOL
The pCO
2
/GSM protocol:
1. allows the sending of SMS alarm messages via GSM modem from the pCO
2
,
2. allows the reception of SMS messages by the pCO
2
sent only from a cellular phone (sending SMS via Internet is not
allowed) for alarm reset and more generally for the direct setting of the variables,
3. as in the case of the pCO
2
/Modem protocol, allows the pCO
2
to communicate with a remote supervisor with the
connection of either a GSM modem or a traditional modem.
The meaning of the pCO
2
data exchanged with the supervisor and the possibility to read or modify it from the
supervisor then depends on the application program used by the pCO
2
itself.
The protocol implemented in the pCO
2
is a subset of the standard Carel point-to-point protocol used for the local
connections. The commands for the transfer of data logging, files and graphs are not available.
SMS
SMS
Data
or