Intermec EasyCoder 501XP Programmer's Reference Manual page 87

Chapter 7 — Reading the Printer's Status
The instruction allows you see the status of various printer
IMMEDIATE
modes and the setting of the standard IN and OUT channels:
? IMMEDIATE MODE
prints a line to the standard OUT port with information on the current
status (ON or OFF) of the following modes:
- Execution
- Immediate
- Input
- Layout Input
? IMMEDIATE STDIO
prints two lines to the standard OUT port with information on the cur-
rent settings for the standard IN and standard OUT channels.
Intermec Direct Protocol v7.80 Programmer's Reference Manual 81