PAD Port Configuration

PAD Port Configuration for Autospeed

Introduction

Autospeed is a convenient way to configure a PAD port's speed, especially when you

 

want a mix of terminal speeds. For example, autospeed is useful when the PAD port

 

is connected to a modem that is being called by devices with different speeds.

Implementing

 

To implement autospeed, set the Port Record parameter Port Speed = AUTO.

Autospeed

When the device calls the port, the port determines the speed of the device and

 

programs its I/O drivers to match the device's speed.

Auto Baud

 

A related parameter that affects Autospeed is the Auto Baud Sequence (in the PAD

Sequence

Port Record). This parameter specifies the Autospeed Recognition Character that the

Parameter

port uses to set the correct speed. These are the settings available under the Auto

 

Baud Sequence parameter:

 

• CR_Only: Autospeed on <CR>.

 

• CR_DOT_CR: Autospeed on <CR>.<CR>.

 

• TYMNET: Autospeed on the letter “a” (must be lower case).

 

• TELENET: Autospeed on <CR><CR> for 1200 bps or lower and @ <CR>

 

for 2400 bps or higher.

 

The default is <CR>. The autobaud feature is extended to support 14.4 Kbps, 19.2

 

Kbps, 28.8 Kbps, and 38.4 Kbps for all autospeed recognition characters. These

 

speeds are not supported on the UIO or AIO cards.

Autospeed Inter-

 

Inter-Character Delay is the transmission time interval between characters. For

Character Delay

example, Figure 4 shows the autospeed inter-character delay applied to the

 

CR_DOT_CR sequence presented above.

CR

. (dot)

CR

100 msec

100 msec

 

Autospeed Inter-Character

Autospeed Inter-Character

 

Delay

 

 

Delay

 

 

 

 

Figure 4. Autospeed Inter-Character Delay

 

Reduced

 

When using a dialup modem with a POS terminal or PC to send an Autobaud

Autospeed Inter-

Sequence, problems may occur if the inter-character delay applied to that sequence is

Character Delay

less than 180 msec. To overcome this, you must enter a CSK

 

(5ERWXW2F76XHLTTUUZC3) to reduce the inter-character processing time to

 

100 msec.

 

 

Note

Reducing the autospeed inter-character delay also has the effect of increasing the minimum supported autospeed to 300 bits/sec.

22

Configuring PAD/ATPAD Ports

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3Com S200 manual PAD Port Configuration for Autospeed
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