During Stewart's talk last night, someone mentioned that Epson receipt
printer had too small buffer and had to time print jobs to avoid losing
data.
There are 2 ways to get printer BUSY status:
1. You can query the printer for "online/offline" status by sending
DLE EOT 1
(0x10 0x04 0x01) and it will return 1 byte. If bit 3 (0x08) is
- 1 -- it is "offline"
- 0 -- it is "online"
2. You can turn on ASB (automatic status back), where printer will send
4 bytes status back to you whenever status changes, such as pressing
FEED button, buffer full, paper out, etc.
To turn on "online/offline" status reporting, send
GS a 2
(0x1d 0x61 0x02). To turn off "online/offline" status reporting,
send
GS a 0
(0x1d 0x61 0x00). From the 4 bytes returned, if bit 3 (0x08) of
first byte is
- 1 -- it is "offline"
- 0 -- it is "online"
--
William
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