User`s guide

Autobaud (AB)

The switch (5) labeled AB on the SLTA-10 Adapter is used to select automatic baud

rate detection-the autobaud feature. Autobaud must not be used when the

SLTA-10 Adapter is used with a modem. When autobaud is enabled, the

SLTA-10 Adapter matches the serial bit rate of a local host.

When powered, the

SLTA-10 Adapter looks for a ‘0’ byte from the host.

The SLTA-10 Adapter cycles

through all the serial bit rates until a ‘0’ is recognized. To initialize the SLTA-10

Adapter, the host must transmit eight binary zeroes (or ASCII NULs), spaced at

least 50ms apart.

The SLTA-10 Adapter will try all of its bit rates until the zero

character is recognized correctly, and will respond with an ALERT ACK character

(hex FE) when it selects the matching serial bit rate. The SLTA-10 Adapter DOS

network driver sends this sequence automatically if the autobaud option

(/A)

specified. The default for an SLTA-10 Adapter is

Autobaud Disable.

4utobaud Enabled

(

Iutobaud Disabled

default)

3aud Determined by

Switches 6, 7, and 8

Figure 4.6 SLTA-10 Adapter Autobaud Switch 5 / AB

If the

option is specified for the DOS network driver, the driver sends the

autobaud sequence every time the driver is opened. However, if the AB option is

enabled, the driver must re-send the autobaud sequence every time the SLTA-10

Adapter cycles power.

For the Windows 95198 or NT network driver, there is no

option. Using these

drivers, the autobaud sequence is attempted following power up

ifAutobaud

Enabled

is selected, otherwise (the default) autobaud will not be attempted.

Serial Bit Rate (Switches(6..8) / BAUD(2..0))

Switches 6 to 8, named BAUD[2..01, are used to set the SLTA-10 Adapter serial bit

rate. This setting is only used if autobaud operation is disabled. There are eight

available bit rates. The SLTA-10 Adapter is configured for 38,400 bps with autobaud

disabled by default.

All data are transmitted using 1 start bit, 8 data bits, no parity bits, and 1 stop bit.

The

option is used to specify the serial bit rate to the DOS network driver.

Configuration