Citizen CT-S300 Command Reference Manual page 132

[Caution]
n = 4, 52 specified (only for B.M specs)
The Black mark length and mark interval currently used are returned in 4-byte code.
All fractional parts in millimeters are rounded off.
Byte 1 + Byte 2 256 = Black mark interval
Byte 3 + Byte 4 256 = Black mark length
Black mark paper
• Under DTR/DSR control, the printer sends the printer ID after verifying that the
host is ready to receive.
• Sending the Black mark length is valid only when Black mark paper is selected.
If the host is not ready to receive, the printer waits for the host to become ready to
receive.
• Under XON/XOFF control, the printer sends the printer ID without checking whether
or not the host is ready to receive.
• Because this command is executed when data is mapped in the receive buffer,
there may be a delay between command receiving and printer ID sending depending
on the condition of the receive buffer.
• If ASB (Automatic Status Back) is enabled by GS a, the host must discriminate
between the printer ID due to this command and the status due to ASB.
(2)
(1)
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