Lukhan LK-T21 - Serial Interface Connection Example

LK-T21 Technical Manual
2.1.5 Serial interface connection example
Host side Printer side
TXD ………………………………… RXD
DSR ………………………………… DTR
RXD ………………………………… TXD
DTR ………………………………… DSR
FG ………………………………… FG
SG ………………………………… SG
DETAILS: ◦Set the handshaking so that the transmit data can be received.
◦Transmit data to the printer after turning on the power and initializing the printer.
B0 B1 B2 B3 B4 B5 B6 B7START
PARITY
"1"
"0"
STOP
1 or 2
Bit
N
one or
1 Bi
t
7 or 8
Bi
t
1Bit
< Figure 2.1 Serial transmission bit frame >
RxD
DTR
ready busy ready busy
buffer full
buffer emptied
"1"
"0"
"0"
"1"
< Figure 2.2 Line transmission with protocol >
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