Anyone have trouble programming, in Labview, a Kollsman Precision Pressure Controller Monitor?

I have a Kollsman PPCM with IEEE-488-1978 standard communication card.  I am having problems getting any response from it.  It is setup such that the listener is on address 20 and talker is on address 23.  This is one of the most bizarre setups I've seen having the luxury of programming mostly newer equipment.  There is a mention of adhering to the standard, but no mention if there is a message terminator, or sample message format.  The commands seem incredibly generic like "A0" commands the altitude of the PPCM to be in feet or meters, rather than mercury.  There is some mention of certain commands preceeding others, and they get jumbled together like "A0B1'', but again no mention of a terminator. Any help on this would be appreciated.
Andy

Meghan
Thanks for the help.   "Not working" ones were sent commands, however the physical response, ie. change modes between airspeed and altitude control, was not there.  As of yesterday, all units are taking commands.   It seems that these machines needed an ''Extra'' EOI (char ''P''), along with the standard EOI, to be sent as a command.  The manual explains this vaguagely and suggests that some controllers may need this and some don't.  ''This prefix may be optional in that it is not required for controllers which automatically generate an EOI or carriage return/line feed indentifier''.  That statement in itself is confusing, but its 1978 standard they are working with.  With the EOI and have already tried the CR/LF, was not sure this was going to work.  Again I appreciate everyones help and being the first time using this forum, it certainly helped me scratch my head in the right direction.
thanks
Andy

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