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7–11Interfaces
Received Data – Serial data stream to the printer.
Transmitted
Data
– Serial data stream from the printer for transmitting status and control information
to the host. Subject to protocol selection.
Request T
o Send (RTS) – Control signal from the printer. Subject to configuration.
Clear
T
o Send (CTS)
– Status signal to the printer indicating the host is ready to receive data/status
signals from the printer.
Data Set Ready (DSR) – Status signal to the printer indicating the host is in a ready condition.
Carrier
Detect (CD)
– Status signal to the printer
. The ON condition is required for the printer to
re
-
ceive
data. A
vailable as a configuration setup option.
Reverse Channel
– Control signal from the printer. Subject to configuration.
Data Terminal Ready (DTR) – Control signal from the printer. Subject to configuration.
Table 7–3. Serial Interface Pin Assignments
INPUT SIGNALS OUTPUT SIGNALS
SIGNAL PIN SIGNAL PIN
Received Data
Clear To Send
Data Set Ready
Carrier Detect
Transmitted Data
Request To Send
Data Terminal Ready
Chassis Ground
Reverse Channel Send
Signal Ground
3
5
6
8
2
4
11, 14
20
1
7
RS–232 Serial Interface Protocols
The
following serial interface protocol characters are available. The protocol
is configuration selec
-
table from the control panel to meet host interface requirements.
X–ON/X–OFF
– The printer transmits an X–ON character (hex 1
1) when entering the on line state or
when
the buf
fer is almost empty
. The printer transmits an X–OFF character (hex 13) when entering
the
off line state or when the buffer is almost full.
DTR
(Data T
erminal Ready)
– Control signal
from the printer
. (Subject to configuration.) Configu
-
rations
include: always true, always false, true if on line and buf
fer not full, and true
if of
f line or buf
fer
almost full. When the printer is off line or when its buffer is almost full, DTR is toggled. When the
printer
is ready to receive data, DTR is toggled back.
ETX/ACK – With ETX/ACK protocol selected, the printer interface operates in a block structured
mode.
The host sends a block of data in response to an ACK character (hex 06) sent from the printer
.
The host marks the end of the block of
data with an ETX character (hex 03). When the printer recog
-
nizes
the ETX character
, the printer releases the data block to be printed and checks
the space available
in
the buf
fer
. If space is available for the next block of data, the printer sends ACK to the host. If space is
not available, the printer withholds ACK until suf
ficient space is available.