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6. Printer interface
1) Interface specifications
Interface
RS232 TTL level
Synchronizing mode
Asynchronous
Handshake *
DTR/DSR signal control or XON/XOFF
control
control
Baud rate *
2400/4800/9600/19200/38400
Bit length *
7 bits/8 bits
Parity check *
Even number/Odd number/No
Stop bit
1 stop bit
* Handshake, Baud rate, Bit length and Parity check are set with the
dip switch.
2) Handshake
A) DTR/DSR control
Handshaking is performed using the DSR signal and DTR signal.
DSR
signal
: Indicating whether the host computer is ready to
receive data or not.
ON
The host computer is ready to receive data.
OFF
The host computer is not ready to receive data.
DTR signal: Indicating whether the printer is in busy condition or not.
ON
The printer is not in busy condition.
OFF
The printer is in busy condition.
B) XON/XOFF control
Handshaking is performed using the XON and XOFF characters.
XON
Transmitted when the printer returns from busy
condition.
condition.
XOFF
Transmitted when the printer gets into busy condition.
In the following cases, the printer is in busy condition.
BUSY CONDITIONS
TIMING OF DTR OFF
OR XOFF
TRANSMISSION
(Printer busy)
TIMING OF DTR ON
OR XON
TRANSMISSION
(Printer ready)
Period between the
time when the power is
turned ON and the time
when it becomes
possible to
communicate
time when the power is
turned ON and the time
when it becomes
possible to
communicate
-------------
When it becomes
possible to
communicate
possible to
communicate
OFF-LINE key entry
Immediately before
OFF-LINE
OFF-LINE
Immediately before
ON-LINE
ON-LINE
Error occurred
∗
1
Immediately before
print stop
print stop
Immediately after
recovery from error
recovery from error
HEAD UP
∗
1
Immediately before
HEAD UP
HEAD UP
Immediately after
recovery from HEAD UP
recovery from HEAD UP
Key waiting at macro
execute
execute
∗
1
Immediately before key
waiting
waiting
Immediately after
recovery from key
waiting
recovery from key
waiting
Set log stamp
∗
2
Immediately after
stamp data receive
stamp data receive
Immediately after data
write for flash memory
write for flash memory
Receive buffer full at
page mode
page mode
When available space
becomes 62 bytes or
less
becomes 62 bytes or
less
Immediately after
printing all the print data
in one page
printing all the print data
in one page
Receive buffer full
When available space
becomes 62 bytes or
less
becomes 62 bytes or
less
When available space
becomes 72 bytes
becomes 72 bytes
∗
1: When DIP SW 1-5 is ON, printer not busy.
∗
2: While writing stamp data for FLASH ROM, all received data
including [DLE] [EOT] and [DLE] [ENQ] are invalid.
3) Example of interface connection
4) Signal description
Signal
name
Description
S. G
Signal ground
TXD
Transmission data
RXD
Receive data
RTS
Always OFF
CTS
Indicates whether the host computer is enable or not.
When the CTS signal is ON, the host computer is disable.
The printer decides that the received data are invalid.
When the CTS signal is OFF, the host computer is
enable.
enable.
The printer decides that the received data are valid.
DSR
In case of DTR/DSR control
Indicates whether the host computer is ready to
receive data or not.
receive data or not.
When the DSR signal is ON, the host computer is
ready to receive data.
ready to receive data.
When the DSR signal is OFF, the host computer is
not ready to receive data.
not ready to receive data.
In case of XON/XOFF control
Does not control the printer.
DTR
In case of DTR/DSR control
Indicates whether the printer is in busy condition or
not.
not.
When the DTR signal is ON, the printer is in normal
condition.
condition.
When the DTR signal is OFF, the host computer is in
busy condition.
busy condition.
In case of XON/XOFF control
Does not control the printer.
When the printer power is OFF, RTS and DTR signal is ON.
TXD
Printer
Host
RXD
DTR
DSR
RTS
CTS
S.G
TXD
RXD
DTR
DSR
RTS
CTS
S.G
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