Xylem iCE3 GPRS Variant - Manual (Page 11)

GPRS iCE 3 , V1.30 User Guide
iQuest (NZ) Ltd - PO Box 15169, Hamilton, New Zealand Tel: +64 7 857 0810 Fax: +64 7 857 0811 Email: [email protected] 7
4 Operation
4.1 LED Indicator
The iCE
3
has a single blue LED mounted on the front panel. This indicates the current device status and can
be useful for diagnostic purposes. The various LED indicator states are as follows:
•
Single 100ms flash every 2 seconds. Idle (command) mode.
•
Two 100ms flashes every 2 seconds. GSM network acquired, connecting.
•
Three 100ms flashes every 2 seconds. GPRS connection in final phases.
•
One 100ms and one 400ms flash every 2 seconds. On-line in data mode (normal operation).
•
Rapid continuous flashing. Waiting for host device wakeup.
(CSI and Unidata loggers only)
4.2 Host Device Type settings and operation
4.2.1 Normal (AT^IHDT=0)
Typical Settings AT^IDFC=0 Forwarding on character disabled.
AT^IDTO=20 Forwarding after 200ms of no more characters from host.
Host Port Communication and Handshaking
On receipt of a GPRS data packet, the iCE
3
will immediately forward it to the host via the RS232 port. The
handshaking lines are completely ignored. Conversely, characters that are received from the host are stored
until either a matching character is detected (if forwarding character not zero) or else no more characters
received for the forwarding timeout period. The packet is then sent to the remote IP address via GPRS.
4.2.2 Campbell Scientific (AT^IHDT=1)
Typical Settings AT^IDFC=0 Forwarding on character disabled.
AT^IDTO=20 Forwarding after 200ms of no further characters from host.
Host Port Communication and Handshaking
On receipt of a GPRS data packet, the iCE
3
will assert its CTS line (which is connected to the logger’s RING
line). The iCE
3
then waits until the logger responds by raising its ME line. The iCE
3
will then output a series of
carriage return characters until the logger detects the baud rate and returns a * prompt. Only then will the
iCE3 send the received data packet to the logger. In reply, characters that are received from the datalogger
are stored until no more characters received for the forwarding timeout period. The packet is then sent back
to the remote IP address via GPRS.
4.2.3 Unidata (AT^IHDT=2)
Typical Settings AT^IDFC=13 Forwarding on character enabled on carriage return (13)
AT^IDTO=0 Forwarding on time disabled.
Host Port Communication and Handshaking
On receipt of a GPRS data packet, the iCE
3
will assert its CTS line (which is connected to the logger’s RTS
line). The iCE
3
then waits until the logger scans and returns a * prompt. The iCE
3
then sends the received
data packet to the logger. In reply, characters that are received from the datalogger are stored until a
forwarding character (normally a carriage return) is received. The packet is then sent back to the remote IP
address via GPRS.