Product Specs

Packet Modem Spec Rev6.doc 29 06/09/00
This mode of operation is useful in cases where power to the module as well
as the rest of the system might be turned off periodically to conserve battery
power.
In case the module “hangs up” and the watchdog circuit doesn’t reset the
module, the user has the option of resetting the module by pulling the
MODULE_RESET_N low. Pulling the line low has the effect of a power on
reset and not just a watchdog reset.
6.3.2.2 Control Port Signals
The Control Port (CP) is an RS-232 level asynchronous interface operating at
9.6 Kbps using Transmit Data (TXD), Receive Data (RXD) Data Terminal
Ready (DTR),Data Set Ready (DSR) and Signal Common (GND).
RXD, TXD, CTS, RTS perform the data transfer and handshaking while DTR
is used to turn on the module and to let it know that there is an application
waiting to talk to it.
The Control Port specifically allows dedicated usage of the Data Port by the
Application and allows all AT commands and Module Alerting and SMS
messages to be sent simultaneously via a separate “control” port to / from the
Modem. This separation of functionality is especially useful in “Dormant”
Mode, when the application and host sessions are active, thus the Data Port
appears active / in use, although a Globalstar traffic channel is not up (no In
Call Status Message).
The control port is “enabled” by asserting DTR on both the Control Port for
AT Commands and Alert Status messages, and the Data port, for the
simultaneous PPP session.
6.3.2.3 Data Port Signals
The Data Port (DP) is an hardware flow controlled, RS-232 level,
asynchronous serial interface.
• The Data Port uses the following RS232 leads for operations: Transmit
Data (TXD), Receive Data (RXD), Clear To Send (CTS), Data Terminal
Ready (DTR), Ready to Send(RTS), Data Carrier Detect (DCD), Ring
Indicator (RI) and Signal Common (GND).
• The format for data on the Data Port is 8 bits, No parity and 1 stop bit.