Black Box 16-Port Rackmount 10/100 Installation Manual page 24

where "x" is any valid character. Non-printable characters can be specified as "\xx" where
xx is the hex value of the character wanted. Note that data can only be saved if the port is
set to dedicated mode. In all other modes autostart chars are discarded.
Once the connection has been started, several different triggers can be used to force the
server to transmit all accumulated serial data to the host. These triggers are individually
described below.
The first trigger will allow serial data to be accumulated until a "timeout" condition has
been detected. This timeout may be either a period of time since the last character was
received or the time since the current "character burst" was started. The command syntax is:
DEF PORT n DATASEND TIMEOUT [IDLE | FRAME] [n | NONE]
Several simple examples should help illustrate how this trigger works. For example the
command "DEFINE PORT 2 DATASEND TIMEOUT IDLE 50" would look like:
xx x (data) x xx x
|----------------------|
50 milliseconds transmit packet
Using the command like "DEF PORT 2 DATASEND TIMEOUT FRAME 150" would
result in the following behavior.
x x x xxx xx (data) x x xx xxxxxxxx xx xxxx xx xxxx
|-------------------------------------------------------------------|
150 milliseconds
The second trigger can be used to specify a one or two byte character se-
quence that will cause the accumulated serial data to be transmitted.
The command syntax is:
DEF PORT n DATASEND CHAR [x1 | ANY | NONE] [x2 | ANY]
Again, examples may help explain how these commands work. The command "DEFINE
PORT 2 DATASEND CHAR Z" would transmit any accumulated data as soon as the "Z"
character is detected in the data stream.
x x x xxx xx x (data) x x xx x x xxxxxxx x Z
|----------------------------------------------------------------|
18
x xxx xx xx
transmit packet.
transmit packet