Star Micronics Dot Impact Printer - Manual (Page 92)

5-2
STAR Command Specifications
Rev. 0.70
5-1-3 Automatic Status
Auto status is a group of states that are automatically returned from the printer to the host when the printer’s status has
changed.Automatic status is composed of “Header 1,” “Header 2” and “plurality of bytes of the printer status and is con-
tinuously returned to the host.The host always uses an identifying method to identify the data for every byte received.
(It is possible that Xon/Xoff codes are exceptionally mixed in the auto status in the Xon/Xoff mode (when using a serial
I/F), so it is necessary to consider that on the receiving side.)The valid/invalid conditions of the auto status abide by the
DIPSW or the memory switch settings for the initial values.
It is possible to change the conditions using the ESC RS a n command after turning ON the power.
Also, it is possible to get the auto status using the ESC ACK SOH command, regardless of the valid/invalid conditions.
1. Header 1
Header 1 is the 1 byte length information transmitted at the head of the automatic status.
The table below shows the composition of the Header 1.Header 1 represents the entire status transmission byte count,
including Header 1, using bit 1 to bit 3 and bit 5.The host gets the transmission byte information and always receives the
status data for that amount transmission bytes.For reference, the table below shows the relationship of actual transmis-
sion bytes and the Header 1.Because the bit 0 that indicates that this is the Header 1 is normally 1 (the second byte and
beyond is 0), to detect the Header 1, it is acceptable to verify that bit 0 is 1 and bit 4 = 0 for this data.Note that bit 6 is
for future expansion and is ignored in host-side processes.
<Header 1 (First Byte)>
Bit Contents
Status By model
“0” “1”
BD100 SP2000 BD500 SP500 SP700
7 Fixed at “0” - - - - - -
6 Reserved (Fixed at 0) - - - - - -
5 Number of printer status bytes ○ ○ ○ ○ ○
4 Fixed at “0” - - - - - -
3 Number of printer status bytes ○ ○ ○ ○ ○
2 Number of printer status bytes ○ ○ ○ ○ ○
1 Number of printer status bytes ○ ○ ○ ○ ○
0 Fixed at “1” - - - - - -
Actual transmission byte count and header 1 table
Transmission Byte Count n
(7 ≤ n ≤ 15)
Header 1
7 00001111B (0F Hex)
8 00100001B (21 Hex)
9 00100011B (23 Hex)
10 00100101B (25 Hex)
11 00100111B (27 Hex)
12 00101001B (29 Hex)
13 00101011B (2B Hex)
14 00101101B (2D Hex)
15 00101111B (2F Hex)