Table of Contents
Advertisement
6.4
Message
Protocols
The following protocols have been prepared for this printer:
. XON/XOFF protocol
. Reverse Channel line (pin 19/11) protocol
. DTR line protocol
. RTS line protocol
The protocols above report the interface buffer state (almost empty or almost
full) to the host and operate according to the printer start/stop state.
6.4.1
XON/XOFF
The XON/XOFF protocol transmits code X'll' (XON) or code X'13' (XOFF)
Conditions
for
XON
Conditions
for
XOFF
The time from when XOFF is transmitted to when DTR is turned from on to off is
0.5 set (for 19.2 or 9.6 K baud) or 1 set (for 2.4 or 4.8 K baud).
For timing details, see Figures 6.5 and 6.6.
6.4.2
Reverse
Channel
When the Reverse Channel signal is on (O),
This signal is turned from off to on under the same conditions under which the
protocol transmits code XON.
This signal is turned from on to off under the same conditions which the
XON/XOFF protocol transmits code XOFF.
For timing details, see Figures 6.3 and 6.4.
protocol
transmission
transmission
line
protocol
the host can transmit data.
the
6 - 19
Advertisement
Table of Contents
