Chapter 12: Miscellaneous Commands128
Most Significant Bit Commands (Epson)
⻬ ML320 E/I, ML321 E/I ⻬ ML320 Turbo, ML321Turbo ⻬ ML520, ML521
⻬ ML390 Turbo, ML391Turbo ⻬ ML590, ML591
Function ASCII Dec Hex
Set Most Significant Bit (MSB) to Zero ESC = 27 61 1B 3D
Set MSB to 1 ESC > 27 62 1B 3E
Cancel MSB Control ESC # 27 35 1B 23
The ESC = command sets the most significant bit (MSB) of an 8-bit data input to zero. The ESC
> command sets the MSB to one. The ESC # command cancels the MSB control established by
either command and all data is interpreted exactly as sent from the computer.
Paper-Out Sensor Commands (IBM/E/ML)
⻬ ML320 E/I, ML321 E/I ⻬ ML320 Turbo, ML321Turbo ⻬ ML520, ML521
⻬ ML320 Std., ML321 Std. ⻬ ML390 Turbo, ML391Turbo ⻬ ML590, ML591
Function IBM Epson ML
Paper-Out Sensor On ASCII: ESC 9
Dec: 27 57
Hex: 1B 39
ASCII: ESC 9
Dec: 27 57
Hex: 1B 39
ASCII: ESC E 0
Dec: 27 69 48
Hex: 1B 45 30
Paper-Out Sensor Off ASCII: ESC 8
Dec: 27 56
Hex: 1B 38
ASCII: ESC 8
Dec: 27 56
Hex: 1B 38
ASCII: ESC E 1
Dec: 27 69 49
Hex: 1B 45 31
The paper-out sensor detects when less than one inch of paper remains (0.5-inch for
ML390/391T printers). When this happens, the alarm light goes on and the printer is
deselected. This command overrides the sensor so that you can print closer to the bottom of the
page. (The feature is also menu selectable.) Be careful if you use this feature, since it lets the
printer continue printing when there's no more paper. This can cause loss of data and may
damage the printhead.
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