co120sq Connect One Ltd., co120sq Datasheet - Page 12

• Manufacturer Part Number: co120sq
• Description: The Ichip? Co120sq Internet Controller? Is A High-performance, Firmware-based Intelligent Peripheral Device That Provides Internet Connectivity Solutions For A Wide Range Of Embedded Devices.
• Manufacturer: Connect One Ltd.

5.2.2.3
iChip's SerialNET mode option extends a local asynchronous serial link to a TCP or UDP
socket across the Internet. Its main purpose is to allow simple devices, which normally
interact over a serial line, to interact in a similar fashion across a network, without
requiring any changes in the device itself. iChip contains a set of associated operational
parameters, which define the nature of the desired network connection. iChip supports
both Server and Client modes in SerialNET mode. AT+i commands are not required to
operate SerialNET mode. Thus, SerialNET mode may be used in existing systems with
little or no need to modify the application program.
5.2.2.4
When Power Save mode is enabled, iChip automatically shuts down most of its circuits
after a period of five seconds of inactivity on the host serial port. The inactivity timeout is
a parameter set by the host. Renewed activity on the host serial port, modem serial port,
or the LAN controller will restore iChip to full operation mode.
5.2.2.5
In Sleep mode, iChip completely shuts down all its circuits. iChip power consumption
goes to an absolute minimum. iChip is restarted with the Reset signal. This mode has
not been implemented yet.
Note: For this mode to be properly used, pin 20 (SLEEP_DIS) must be pulled-down to
GND.
5.2.3 Host Serial Connection
iChip supports a full-duplex, TTL-level serial communications link with the host
processor. Full EIA-232-D hardware flow control, including Tx, Rx, CTS, and RTS lines,
is supported.
CO120SQ supports standard baud rate configurations from 2,400 bps up to 115,200 bps
with auto baud rate detection and one high-speed, non-standard, 250Kbps on the host
asynchronous serial communications channel. The default baud rate may be changed
permanently by using the AT+iBDRF command.
5.2.4 Hardware and Software Flow Control
Hardware flow control is supported between the host serial connection and iChip.
Flow control is programmed via the AT+iFLW command. The default flow control method
is set to “Wait/Continue” software flow control (which is similar to XON/XOFF software
flow control) between iChip and the host processor.
The hardware flow control method frees the host CPU from monitoring and handling the
software flow control. The host can program iChip to either use hardware flow control or
“Wait/Continue” software flow control. The flow control mechanism is based on the
RTS/CTS signals.
iChip CO120SQ Data Sheet
SerialNET Mode
Power Save Mode
Sleep Mode
Pin Descriptions
5-2