Seth:

This is how to get the trip information from a high voltage PC.  Much of
this note is extracted from Aseet's description.

You need to have a device in the database for the master channel.  The
suffix for this device is "L" (instead of "V" or "I").

I have added the device E:PC1L to the database.  Here is the dabbel file.
Important points to notice are:

    ADD E:PC1L ('PC 1 Master V List', CDFFE)

    !--- NO EMX  

    SSDNHX READNG (79FF/160E/6497/4B00)
                   |           |   |
                   |           +---+--- This is RAD50 for "PC1L"
                   +--- These devices are 79FF (other PC devices are 75FF)

    PRO READNG (2, 512, 60)
                    |
                    +--- Maximum length is 512 bytes


What the front end will do is return to the user the following buffer,
which it received from the PC.  The buffer contains a list of k device
names, with I status and V status for each.

    <b><name 1><b><I status 1><b><V status 1>:<name 2><b><I status 2>...
	...<V status k-1>:<name k><b><I status k><V status k>:<null>

Where:

    <b> ........... blanks
    : ............. colon character used as separator between each channel
    <name> ........ 1 to 5 character name of an individual channel
    <I status> .... 1-2 character hex status for device <individual name>I,
	            i.e. the hardware status of the channel.
    <V status> .... 1-2 character hex status for device <individual name>V,
                    i.e. the software ("expected") status of the channel
    <null> ........ a zero byte to terminate the string

Only channels which have tripped are included in this response.  If the
master has NO channels with a trip, you can expect a single colon
surrounded by blanks.

The maximum length of the response (for 26 channels) is about 315 bytes.
The front end will respond to any length up to 512 bytes, so you can ask
for any amount up to this limit.  The idea is that you should ask for a
buffer no smaller than the maximum.  The response string (which has an
upredictable length) will be terminated by a zero byte, so you can scan
the buffer you get back to extract the response.

Aseet and Boris: please correct any misinformation.
