User manual

Chapter 4 Configuration
Page 11 Dec 2009
Chapter Three OPERATION
3.1 Operating Modes
The 605M-D1 operates in one of two modes, Automatic Connect Mode or AT Command Mode.
Automatic Connect Mode allows the modem to operate with host equipment that is not designed to operate with
modems. The modem makes a connection to a pre-configured TCP port and location, then transparently transfers
data over the configured connection.
AT Command Mode is used when the host equipment is designed to operate with a modem. The host equipment
needs to support AT commands to command the modem to make the required connections.
3.2 Automatic Connect Mode
In this mode, the modem automatically make a connection between the onboard RS-232 serial port and a TCP
connection point (port) on a remote device which is connected to the internet. This socket may be either an internal
connection point (TCP port) on a 605M-R1 Device Server, to a virtual serial port on a PC, or any other TCP socket
with access to the internet.
Automatic Connect mode is configured with the supplied 605M-D1 Configuration utility. Refer to the Configuration
Manual (man_605M-D1-Config) for detail on how to use the configuration utility to test, diagnose, and configure the
modem.
At power-up, the modem waits 10 seconds to allow access by the configuration utility. If the modem receives any
configuration commands during this time, it will abort the start up sequence and wait for further commands.
Note: Because of this behavior, it is important to ensure that any host equipment does not send any data containing
the sequence “AT” within 10 seconds of power-on. The RS-232 DCD pin will be low until the modem makes a
connection to the remote TCP device. The “SENSE” wire on the power connector will go active low when the modem
makes a connection to the remote TCP device.
After 10 seconds, the modem attempts to connect to the cellular network. On connection, the modem optionally
sends an SMS message to report that it has connected. Once it is connected to the cellular network, it attempts to
connect to a TCP port on a remote device. If the connection is lost, or if the connection cannot be made, the modem
may be configured to attempt to connect to a redundant secondary socket location. If both the primary and
redundant secondary socket are unavailable, the modem can be configured to send an alarm message via SMS. At
this stage, the modem may be configured to either wait for an SMS message commanding it to restart, or can be
configured to re-try the connection to the primary and secondary connection locations.
3.3 AT Command Mode
In this mode, the modem waits for AT Commands from the host device. The host device must be able to issue the
appropriate AT commands to force the modem to perform the required behavior. This mode provides full access to
all of the features of the modem, including SMS, TCP-IP connection, and FAX data.
At power up, the modem issues the prompt “OK”, and then waits for commands from the host. At this point the host
can issue AT commands to:
• Send an SMS Message
• Make a TCP-IP connection to a remote device
• Make a serial data connection to a remote device
• Transfer data to a remote FTP server
• Refer to Appendix A for a full list of supported AT commands.