User's Manual

Integration Guide
Version 1.07
GSM0100PB001 Page 27 1.07 - 1/9/04
6.7.2 Ring Indicate
The Enabler II-G 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 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 II-G can be configured to send or not to
send URCs upon the receipt of SMS. See Enfora GSM/GPRS OEM Module AT Command Set Reference
- GSM0102PB001MAN.
Figure 9 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