In short, the format is:

SCSI: tty[identifier][scsi_id][pod][port]
EtherLite®: tty[nN][unit_number][port]
 

• [identifier] Identifies both the SCSI bus number as well as whether it's a dialout (non-blocking) or dial-in (blocking) node.

  LOWER CASE: BLOCKING (waits in open() for DCD to go true)
  UPPER CASE: NON-BLOCKING
   

  For SCSI, it will be a letter in the range starting with "c" (and "C"), and ending with "j" (and "J"). We start with c for the first SCSI bus (typcially esp0), and increment letters for additional SCSI buses.

  For EtherLite, it will always be "n" or "N".

   

• [scsi_id] is the SCSI address of the unit
   

   

• [unit_number] is the numerical id assigned to each EtherLite® as it's installed, such as 0 for els0 (first unit installed), 1 for els1, and so on.

   

• [pod] only applies to our 200x product line, and will simply be missing on nodes made for our other products. It refers to the "FASlink" ID on the 2008 "ports" unit.

   

• [port] is the number of the port, starting from 0. However, to support our newer 32 port devices, we have extended the range as follows:

      Port  number: 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16
      "port" value: 0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
   
      Port  number: 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
      "port" value:  g  h  i  j  k  l  m  n  o  p  q  r  s  t  u  v
      

In other words, if we had a 1008+ at SCSI ID 5, we would end up with dial-in nodes ttyc50-ttyc57 and dial-out nodes ttyC50-ttyC57 in the /dev directory for Solaris 1.x (SunOS 4.1.x), and the /dev/sts directory for Solaris 2.x (SunOS 5.x).

Our parallel port will always be lpc, where the xx would be replace by the 2-3 numbers used in the tty nodes. For the above 1008+, it would end up being lpc58.