To disable activation of the relay by calling the following command is sent to the board
(the relay can still be activated by SMS text; see OPEN/ON & CLOSE/OFF commands):
CALL NONE
To switch the inputs on and off the CALL DIALER command is used. There is no relay activa-
tion by calling in this mode (although it can be activated by SMS text)
CALL DIALER switches the inputs on and off (see section 4)
When the inputs are being disabled the call is rejected; when the inputs are being en-
abled the system rings out
3.2 Call Reject
By default any call to the system will be allowed to ring indefinitely (or up to the host net-
work time limit). This is to avoid calls being diverted to voicemail when rejected by the sys-
tem. However the system can be instructed to reject (hang up) calls using the REJECT
command:
REJECT ALL rejects all valid calls
The reject command can also be used to determine the status of the relay when in toggle
mode by sending the following command:
REJECT OPEN rejects the call when the call is deactivating the relay
connects the call when the call is activating the relay
REJECT NONE disables all call rejection
3.3 Connecting a Call
By default, when called the system is set to ring indefinitely or until the SIM card network
operator transfers the call to voicemail. However the system can be set to connect a call
when the input is OPen (high/12V) or Closed (low/0V). This is done to allow the caller to
know the state of the input even when the system has insufficient credit to send a status
SMS text message. See also the REJECT command if call rejection is preferred.
To change the connect mode the CONN command is sent by the master phone with the
action CL or OP. To disable connect on call the NOne action is sent.
e.g. CONN CL connect when input high
CONN OP connect when input low
CONN NO do not connect call
3.4 Input/Output Status Message
To determine the current status of the input terminal and output relay the STATUS command
is sent to the system telephone number by a master phone as follows:
STATUS
The system will respond with a SMS text message as follows:
RELAY OPEN INPUT LOW relay not activated/input closed (GND)
RELAY CLOSED INPUT HIGH relay activated/input open (+V)
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