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Programmer' s Guide
Display Pass Through
The display pass through feature allows a pole display to be interconnected with the printer. The printer is
connected to a host system with a specific pin numbered serial cable. The host sends serial data to the printer and
the printer sends serial data to the pole display. The printer does not provide power to the display. During normal
printer operation, no data is passed to the display. In pass through mode, all received data is passed on to the
display.
Pass Through Restrictions and Considerations
1.
Pass through only works on serial printers with DTR flow control.
2.
XON/XOFF mode does not work correctly.
3.
All inquire ([ENQ]) commands are active when not in actual pass through mode. If, for example, an [ENQ]
command for cash drawer status is received by the printer, the response is transmitted. When pass through is
active, all data except the [ENQ] is passed. The printer does not look for or act on any commands other than
inquires.
4.
If pass through data is sent to the printer in continuous mode (i.e. as fast as possible), each [ENQ] character in
the sequence delays the transmission of data by one byte. The printer buffer size is limited. If the buffer
overruns, data will be lost.
5.
Modem handshake signals from the printer are not controlled during pass through. Their state is set by printer
status. Opening the cover toggles the control lines. When the printer cover is open, it accepts data, including
all [ENQ] commands. If an [ENQ] # is received when off line, pass through is entered.
6.
Previously buffered data is processed by the printer in pass through mode. Printer performance is degraded by
the processing of pass through data.
7.
In 8-bit, no parity mode, data is passed through unaltered. In all other modes, the parity is checked, stripped,
and then regenerated by the printer.
8.
Pass through has no affect on a printer in parallel mode.
Remote Power Control
®
The POSjet
1500 Printer has a remote power control command that instructs it to enter STANDBY/OFF mode.
When the command is issued, the printer performs print cartridge maintenance and enters STANDBY/OFF mode.
Unlike pushing the * Button, remote power mode leaves the communications active. All commands except the exit
power down command are ignored.
Function
Remote Power Control
ASCII
[ESC] y <n>
Hexadecimal
1BH 79H <n>
Decimal
<27> <121> <n>
IPCL
&%YX17 or &%YX18
EPOS
[ESC] y <n>
Where n
17 Requests the printer to enter remote OFF
18 Requests the printer to exit remote OFF
Description
Inquiry (ENQ) commands are accepted and answered in remote power down mode.
The printer reactivates if the * Button is pressed or a power up command is received.
Note:
If power is lost after the power down command is issued, the printer remembers it is in power
down mode but does not reactivate the communications link. The * Button must be pushed to
return the printer to full operation.
Nov-07
®
POSjet
1500
Rev M
Port Protocols and
Connection Specifics
Page 265
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Troubleshooting
