When Answering If No Port Select; Serial Port Configuration Screen - Honeywell CNI2 Operating And Installation Manual

Also see the next discussion about port selection as this also affects the transparent mode of
operation.

When Answering if No Port Select.......

This setting is used when the CNI2 is allowed to enter "transparent" mode. In this mode the
CNI2 will establish a transparent communications link between the host system and the device
attached to one of its serial ports (see previous discussions). This mode is only possible if (a)
the CNI2 has been configured as a "Transparent Modem" or (b) the CNI2 is configured as a
Metretek or Mercury data logger and the "Allow Transparent" box is checked.
The CNI2 has one on-board serial port (Port-1). This can be expanded to two ports using the
Serial Port Multiplexer discussed earlier in this document. Future options will allow up to 7
additional ports to be added.
Each port is assigned a unique ID number using the Serial Port Configuration screen, to be
discussed shortly. Port-1 is automatically assigned the RUID that is assigned to the entire
CNI2. Port-2 and beyond are assigned unique ID numbers by you.
When the CNI2 receives an incoming connection request, or is paged to call back to the central
office, it needs to know which serial port to select for the call. Once the connection with the host
is established the CNI2 will wait a certain number of seconds (defined by you) for a special
command to arrive from the host. This command has the format:
where "xxxxxx" is the ID of one of the serial ports and <cr> is a carriage return character. The
"xxxxxx" must contain all six digits of the RUID including leading 0's.
If the ID number in the command is valid and that port is enabled (via the Serial Port
Configuration screen), then CNI2 will return the following response:
where "xxxxxx" is the ID of the serial port, <lf> is a line feed character and <cr> is a carriage
return character.
If the ID number in the command is not in the list, or if that particular port is not enabled (via the
Serial Port Configuration screen), then the "Route To" port will be selected and the CNI2 will
return the following response:
<cr><lf> INVALID PORT NUMBER OR PORT IS NOT ENABLED<cr><lf>
If the +-+PA command is not received within the specified time frame then the CNI2 will select a
port based on the "Route To" setting.
CNI2 Operating and Installation Guide
+-+PAxxxxxx<cr>
<cr><lf> CONNECTED TO PORT- xxxxxx<cr><lf>
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