Integration Guide
Draft
EDG0208IG001
Page 32
Rev. 1.03 –4/19/07
6.7.5
Serial Interface (9 Pin I/F) (See table in section 6.4.1 I/O Connector Pin Assignments)
The modem provides a standard 16550 UART serial interface to the host. The data interface operates at
CMOS level.
The Enabler EDG0208 is designed to be used like a DCE device. RxData is the serial data from the modem
to the host. TxData is the serial data from the host to the modem.
Figure 17 Enabler EDG0208 Serial Interface
This data may contain 7 or 8 data bits, 1 or 2 stop bits, even/odd/no parity bits. The baud rate may be
adjusted to
9600, 14400, 28800, 38400, 57600, 115200, 230400, 460800
.
Default settings are 8 data, 1 stop, no parity, and 115200 baud. DTR may be used to force the modem into
AT command mode from online data mode (See AT Command Document, command AT&D). RTS and CTS
may be used for hardware handshaking. DSR is always active (connected to ground) while the modem is
on. RING may be used to alert the host to a variety of incoming calls.
For a minimal implementation, connect RxData and TxData to the COM port serial data lines, connect DTR
and RTS to GND.
PARAMETER
PARAMETER / CONDITIONS
MIN
TYP
MAX
UNIT
V
IL
Input Voltage – Low
0
0.8
Vdc
V
IH
Input Voltage – High
2.0
Vdc
V
OL
Output Voltage – Low
0.65
Vdc
V
OH
Output Voltage – High
2.4
Vdc
I
OL
/ I
OH
Rated
Output
Current
4
mA
RING
CTS
DTR
DSR
RTS
Rx
Tx
Enabler II-E
UART
DCD
Host
Summary of Contents for Enabler EDG0208
Page 26: ...Integration Guide Draft EDG0208IG001 Page 21 Rev 1 03 4 19 07 Figure 11 Back of EDG0208 01 ...
Page 28: ...Integration Guide Draft EDG0208IG001 Page 23 Rev 1 03 4 19 07 Figure 13 Back of EDG0208 01 ...
Page 29: ...Integration Guide Draft EDG0208IG001 Page 24 Rev 1 03 4 19 07 Figure 14 Front of EDG0208 02 ...
