Star Micronics SP2000 manual Auto Status Specifications

3. Auto Status Specifications

3-1. Auto Status

Auto status is a function that automatically relays any changes that occur in the status of the printer from the printer to the host. It is composed of the “Header -1,” “Header - 2” and “a plurality of bytes of printer states.”

The host always identifies the data using the method of identification for each byte received. (For example: This is necessary in consideration of the receiving side because there is the possibility that the X on/X off code could be included in the automatic status part way through transmission when in the Xon/Xoff mode [Serial I/F]).

Conditions for the validity and invalidity of the autmatic status abide by the initial values of the settings of DIP switch 1-6. You can change the condition using the <ESC> <RS> “a” n command after turning ON the power.

You can acquire the automatic status regardless of it being valid or invalid using the <ESC> <ACK> <SOH> command.

Header 1

Header 1 is 1 byte of information heading the automatic status. Header 1 is composed of the items in Table 3-1 below. Header 1 indicates the byte count of the transmission of the entire status including Header 1 with bits 1 to 3 and bit 5. The host gets the information of the transmitted byte count and always receives the status data of the amount of the transmitted byte count. For reference, Table 3-2 shows the relationship of the actual transmitted byte count and the Header 1.

Bit 0 is always 1 (always 0 after the second byte) to indicate that it is the header data of Header 1 so when detecting Header 1, you can check that bit 0 = 1 and bit 4 = 0.

Bit 6 is for future expansion, so it is ignored in the processing on the host.

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