GSM0128IG001
29
Revision Draft – 9/22/08
6.8.2
Ring Indicate (Pin 49)
The Enabler IIG module is capable of using the Ring line to discern the type of incoming call. The indicator
can be monitored via a hardware line available on the 60 pin I/O signal connector. The Ring Indicator pin is
#49.
The function of the Ring line depends on the type of the call received.
When the module is receiving a
voice call,
the Ring line goes low for 1 second and high for another 2
seconds. Every three (3) seconds the ring string is generated and sent over the Receive (Data Out) (Rx)
line. If there is a call in progress and call waiting is activated for a connected handset or hands free device,
the Ring pin switches to ground in order to generate acoustic signals that indicate the waiting call.
When a
Fax
or
data call
is received, Ring goes low and will remain low. Every 3 seconds a ring string is
generated and sent over the Receive (Data Out) (Rx) line.
An incoming
SMS
can be indicated by an Unsolicited Result Code (URC) which causes the Ring line to go
low for 1 second only. Using the AT+CNMI command, the Enabler IIG can be configured to send or not to
send URCs upon the receipt of SMS. See Enfora
GSM0128AT001 – Enfora Enabler IIG AT Command
Set.
Figure 8 - Ring Indicate Timing
1 second
URC
Ring
1 second
2 seconds
1 second
2 seconds
RING String
RING String
Ring
3 seconds
RING String
RING String
Ring
3 seconds
RING String
