TEC SX4T - B B/W Direct Thermal User Manual page 126

1. OUTLINE
T
READY/BUSY (RTS) Protocol
• When initialized after power on, this printer becomes ready to receive data and converts
the RTS signal to "High" level (READY).
• The printer converts the RTS signal to "Low" level (BUSY) when the free area in the
receive buffer amount to 10K bytes or less.
• The printer converts the RTS signal to "High" level (READY) when the free area in the
receive buffer amount to 512KB or more.
• When there is no free area in the receive buffer, the printer discards received data which
exceed the receive buffer capacity without storing it in the buffer. (After detecting a
BUSY signal, the host computer must stop transmission before the printer receive buffer
becomes full.)
• The DTR signal is always "High" level (READY).
• The host should keep the DSR signal "High" level.
NOTE: Be sure to select the READY/BUSY (RTS) protocol when controlling the flow between
the Windows. Also, be sure to select "Hardware" for the flow control in the Windows
communication port setting.
k
Pin description
Pin No.
1 FG (Frame Ground)
2 RD (Received Data)
3 TD (Transmit Data)
4 CTS (Clear to Send)
5 RTS (Request to Send)
6 DTR (Data Terminal Ready)
7 SG (Signal Ground)
20 DSR (Data Set Ready)
Signal I/O
---
Input
Output
Input
Output
Output
---
Input
1- 8
Description
Ground line for circuit protection.
Data line from which the printer receives data from the
host (receive data line).
Logic "1" is "Low", and "0" is "High". It is LOW (MARK)
while no data is being sent.
Data line from which the printer sends data to the host
(send data line).
Logic "1" is "low", and "0" is "High". It is LOW (MARK)
while no data is being sent.
Input signal from the host. This printer ignores this
signal.
Output signal to the host.
When READ/BUSY (RTS) protocol is selected,
this signal means READY to receive data.
When the receive buffer is nearly full, the signal turns
to "Low", and "High" when nearly empty.
In case of other protocol is selected, this signal is
always "High" level after the power is turned on.
Output signal from the printer.
When READY/BUSY (DTR) or XON/XOFF
(DC1/DC3)+READY/BUSY (DTR) is selected, this
signal means READY to receive data.
When the receive buffer is nearly full, the signal turns
to "Low", and "High" when nearly eimpty.
In case of XON/XOFF (DC1/DC3) or READY/BUSY
(RTS), this signal is always "High" level after the power
is turned on.
Ground line for all data and control signals.
Input signal from the host. It must be "High" for the
printer to receive data.
EO10-33013A
1.5 ELECTRONICS SPECIFICATIONS