Serial Interface Connection Example - Citizen CMP-30 series Technical Manual

2.1.4 Serial interface connection example

Host side
TXD ....................................... RXD
DSR ....................................... DTR
RXD ....................................... TXD
FG ....................................... FG
SG ....................................... SG
DETAILS: ◦Set the handshaking so that the transmit data can be received.
"1"
"0"
1 Bit
START
"1"
RxD
"0"
"1"
DTR
"0"
Printer side
◦Transmit data to the printer after turning on the power and initializing
the printer.
7 or 8
Bit
B0 B1 B2 B3
< Figure 2.1 Serial transmission bit frame >
ready
< Figure 2.2 Line transmission with protocol >
- 8 -
None or
1 Bit
B4 B5 B6 B7
buffer emptied
buffer full
busy ready
1 or 2
Bit
PARITY STOP
busy