Spoolable HP printers supported by MPE can emulate IBM 3287 printers.
You can use Pass Thru with any of the printers listed in Appendix C “Pass Thru Terminal and Printer Specifications” However, you cannot use a printer that is attached
directly to a terminal. Pass Thru requires that a printer be configured
into MPE as a system printer.
Pass Thru acquires MPE ownership of HP 3000 printers. Then,
for each write from the host application to a printer, SNA IMF formats
data and sends it to a spool file destined for the corresponding
printer. The default name of the printer file is a string of blank
characters, but you can specify a different name for the printer
file in the PFN parameter of the command that starts Pass Thru. (See Chapter 3 “Starting Pass Thru”)
After your Pass Thru session has started, you can enter printer commands
and send emulated IBM 3287 keys by issuing the following MPE command:
:RUN TTSSON.PUB.SYS, COMMAND; INFO="info string"
The info string may contain one or more printer commands. See "Entering
Printer Commands and Adjusting Page Length," later in this chapter.
SNA IMF supports both LU.T1 and LU.T3 printers. It accepts
both LU.T1 and LU.T3 sessions on the same printer.
LU.T1 printers use the SNA Character String (SCS) data stream
and SCS control codes. SCS control codes allow you to define horizontal
and vertical formatting of paper forms. Appendix B “SNA Character String (SCS) Support” lists
the SCS control codes emulated by Pass Thru.
In an LU.T1 printer session you can emulate pressing the IBM
3287 [HOLD PRINT], [PA1], [PA2], [CANCEL], and [ENABLE PRINT] keys. You cannot emulate these keys in an LU.T3 printer
session. See "Entering Printer Commands and Adjusting Page
Length," later in this chapter.
