Specifications

Cascade Modem Manual
Copyright © 2007 Diamond Traffic Products, Inc
Page 8
2.2. Automatic Speed/Format Sensing
The modem can automatically determine the speed and format of the data sent from the DTE. The modem can
sense speeds of: (57.6k) 300, 600, 1200, 2400, 4800, 7200, 9600, 12.0k, 14.4k, 19.2k, 1038.4k, 1157.6k, 12115.2k,
13230.4k, 14245.76k, and 15307.2k
The modem can sense the following data formats:
Parity
Data Length
(No. of Bits)
No of Stop
Bits
Character
Length
(No. of Bits)
None
7
2
10
Odd
7
1
10
Even
7
1
10
None
8
1
10
Odd
8
1
11*
Even
8
1
11*
* 11 bit characters are sensed, but the parity bits are stripped off
during data transmission in Normal and Error Correction modes.
The modem can sense data with mark or space parity and configures itself as follows:
DTE Configuration
Modem Configuation
7 Mark
7 none
7 space
8 none
8 mark
8 none
8 space
8 even
The modem operates in asynchronous mode and supports a 5V, RS232 - like interface - V.24 (EIA-232-D).
The resident Modulator/Demodulator supports line equalization and forward error correction required at higher
speed data rates.
The Cascade Modem is trained to a selected speed with an AT [CR] training sequence. Thus, DTE, to modem
interface speed, is locked in regardless of the connecting speed of a remote modem, (with minor restrictions, see
the AT+MS command).
This allows for selection of a modulation speed which the modem will support. The DTE modem interface speed
should be set to the highest modulation speed to avoid the use of flow control. Flow control facilitates
communication with higher speed modems by the DTE so that the data is not lost.