FMH Bit Not Set in Query Reply with Function Management Header

CAUSE

If a host sends a Read Partition Query command in an RU containing a

Function Management Header (FMH), the reply sent by the SNA Print
Server

does not have the FMH bit set, even though the reply contains a Function Management Header. The host responds to this with a SHUTD command, and then an UNBIND, and then automatically starts the cycle again with a new bind. Each cycle results in a blank page being ejected by the printer.

The following trace excerpt shows a Read Partition Query in an RU with a

Function Management Header, followed by an improperly formatted
response.

Read Partition Query with Function Management Header:

   DLC   01160000->03020101 DLC DATA
   DLC                      DAF:20 OAF:01 ODAI:off Normal
   DLC                      RQE FMD FI BC EC DR1 PI BB CD
   DLC
   DLC   ---- Header  at address 010D42AC, 1 elements ----
   DLC   00000000 00002C00 20010002 0100EA00     <......,........>
   DLC
   DLC   ---- Element at address 015CF900, start 10, end 23 ----
   DLC   0B91A006 01000B60 00000501 FF02 <.j.....`......  >

Note that byte 0, bit 4 of the RH is set, indicating the present of an FMH in an FMD frame. The FMH is 0601000B6000.

Query Reply sent by SNA Print Server:

   DLC   03020101->01160000 DLC DATA
   DLC                      DAF:01 OAF:20 ODAI:off Normal
   DLC                      RQE FMD BC EC DR1 CD
   DLC
   DLC   ---- Header  at address 010D44E8, 1 elements ----
   DLC   00020B6F 62002C00 01200001 0100EA00     <...ob.,........>
   DLC
   DLC   ---- Element at address 015CF900, start 10, end 137 ----
   DLC   03902006 01008B60 00000C81 80808185     <......`...a..ae>
   DLC   86878895 A6001781 811F0000 50001800 <fghnw..aa...P...>
   DLC   00010064 0002008C 0A0807B0 00148185 <...d..........ae>
   DLC   82000A08 04000000 07000000 00000000 <b...............>
   DLC   00168186 400800F7 F100F200 F300F400 <..af@..71.2.3.4.>
   DLC   F500F600 F700000D 81870400 F0F100F2 <5.6.7...ag..01.2>
   DLC   00F40000 0C819500 00080008 00010100 <.4...an.........>
   DLC   1181A600 000B0300 000007B0 000007B0 <.aw.............>

Note that in the reply, byte 0, bit 4 is not set. However, the FMH is still present.