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MODEM 32144
Setting the Auto-Answer option
to ENABLE resets Hayes mode
register S0 to 1 (meaning that calls
will be answered on the first ring).
3.10 Data Format Options
Data Format (Sync or Async)
V.25 bis, Dumb, Leased line modes
The data-format setting for the
local modem and for the remote
modem must be the same.
ASYNCHRONOUS. Data is
transmitted and received in the
character asynchronous format.
The character length (next option)
must be the same for both
communicating modems.
SYNCHRONOUS. If this setting
is selected, data must be
transmitted and received in the
synchronous format. The
appropriate transmitter clocking
setting must be selected—see
TRANSMITTER CLOCKING later
in this chapter. The synchronous
data format is not available for data
rates of 300, 19.2, or 38.4 Kbps.
Character Length
All modes (asynchronous
operation only)
This option selects a character
length of 9, 10, or 11 bits for
character asynchronous operation.
The same character length must be
56
selected for both the local and the
remote modems. Use pushbuttons
1 and 3 to select the desired
character length. The most widely
used character-length setting is
10 bits.
9 BITS: 1 start bit, 7 data bits,
and 1 or more stop bits.
10 BITS: 1 start bit, 8 data bits,
including parity, and 1 or more
stop bits.
11 BITS: 1 start bit, 9 data bits,
including parity, and 1 or more
stop bits.
Parity
All modes
Parity selections will be effective
only if error correction or buffer
mode has been enabled or if the
modem is in 2-wire dial Hayes
mode. For most applications, parity
should be set to NONE.
The following parity options are
available: NONE (no parity),
ODD, EVEN, MARK (parity is
always 1) and SPACE (parity is
always 0). All parity settings except
NONE automatically enable parity
conversion (except in Hayes
mode), meaning that the parity of
received data will be converted to
match the selected parity option.
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