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13. Defined Printer Responses

All defined data sent by the Smart Label Printer will have bits 6:7 set to 00, 10, or 11.

This allows the host to easily distinguish between defined data and the status byte.

Hex Value Definition

11 XON

13 XOFF

80 Firmware Version 0 (Alpha Test)

81 Firmware Version 1 (1st Production Version)

8n Firmware Version “n”

C0 Printer is On-Line

C1 Printer is in Standby Mode (except SLP 440/450)

C2 Printer is Off-Line

C7 CMD_CHECKPOINT response

C9 CMD_CHECK response

Dn CMD_GETOPTIONS response / USB ID number

E1 Printer is SLP EZ30

E2 Printer is SLP Pro

E4 Printer is SLP 120

E5 Printer is SLP 220

E6 Printer is SLP 100 (narrow head, pre-v5 firmware)

E7 Printer is SLP 200 (wide head, pre-v5 firmware)

E8 Printer is SLP 410 (narrow head) or SLP 100 (v5 firmware)

E9 Printer is SLP 420 (wide head) or SLP 200 (v5 firmware)

EB Printer is SLP 240/430 (wide head)

EC Printer is SLP 440 (300dpi)

ED Printer is SLP 450 (300dpi)

Summary of defined printer responses

Version Byte Definition

The version byte always has a base value of 80 hex. Bit 6 (40 hex) is always zero.

The firmware version number is added to the base value to produce a response

byte that is returned for the CMD_VERSION command. For example, if the

firmware version is 5, the version byte would be 85 hex.

- SLP 410/420/430: 80h

- SLP 450 38k bps version: 81h or 82h

- SLP 440/450: on and after 83h

XON/XOFF Definition

When the input buffer is almost full (less than 32 bytes free), the printer will

indicate a “buffer full” condition by sending an XOFF character (13h) to the host.

After the “buffer full” condition has occurred and the input buffer has been

emptied to the point where there are at least 100 bytes free, the printer will send an

XON character (11h) to the host.

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