Connect On Dtr High - Honeywell CNI2 Operating And Installation Manual

CNI2 Operating and Installation Guide
the serial device can change this to a simple "CONNECT" message by issuing an "ATX"
command. However some serial devices may simply expect a simple "CONNECT" message
and will not issue any additional commands to make this happen. In this case check the Edit
CONNECT Message box.
You must specify the exact message in the Connect Message window. This includes non-
readable (control) characters. Non-verbose responses are often one to two ASCII numbers
followed by a carriage return character. Verbose messages are normally preceded and
followed by a carriage return and line feed combination. Use the "Enter" key on your keyboard
to insert a carriage return and line feed combination. To insert a single line feed character press
and hold the ALT key while on the keyboard's numeric keypad enter the digits 0 1 0. Then
release the ALT key. To insert a single carriage return character press and hold the ALT key
while on the keyboard's numeric keypad enter the digits 0 1 3. Then release the ALT key. In
either case you will not actually see the characters in the window, but you may see the cursor
move to the next line.

Connect on DTR High

Some serial devices may indicate a desire to place a call by simply activating a control line. On
the CNI2's TB2 terminal block is an input line called DTR. If the DTR input line on the
communications terminal block goes positive, the CNI2 will wait 10 seconds for an "ATD" (dial)
or "ATA" (answer) command from the device. If a command is received the CNI2 will start the
call process. Otherwise a call will be placed after 10 seconds and the CNI2 will behave
according to the Always Send Connect Message setting. If enabled a "CONNECT" message
will be sent to the serial device once the connection with the central computer has been
established. The call will end with a "NO CARRIER" message. If the connection cannot be
established a "NO CARRIER" message is returned.
As discussed earlier two remote devices can be wired to the same CNI2 using the optional
Serial Port Multiplexer board. Either remote device can raise the DTR line but the CNI2 will not
be able to determine which device is actually asserting the line. If the wrong port is selected
when this happens the CNI2 may not see the "ATD" command if the remote device issues one.
NOTE
When the CNI2 is in low-power "sleep" mode it can only detect that the DTR line has gone
active if the JP3-2 jumper is in the "A-B" position. See the next illustration.
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