Printer Description - Welch Allyn Spot Vital Signs LXi Service Manual

40 Spot Vital Signs LXi Technical Overview

Printer Description

All models of the Ap1300 printer use an industry standard RS-232 interface. The default
parameters are 9600 baud, 8 data bits, 1 stop bit, and no parity.
Serial data is expected in standard RS-232C format with -12 Volt meaning 'mark' or '1' and
+12 Volt a logical '0', with reference to the common ground. The serial data output line,
TxD, transmits XON/XOFF and status information to the host at the same Baud rate and in
the same format as the serial data input. The hardware busy line is true (nominal -12 Volt)
when busy. Both serial output lines will relax to approximately 0 Volt when the Ap1300 is
in sleep mode and the user must allow a short period after awakening before relying on
the values of these signals.
The Ap1300 has three operating modes, when not actually printing.
Idle Mode
Sleep Mode
Spool Mode
Different color combinations on the front-panel LED indicate the modes. No light is
emitted in sleep mode.
Table 1. LED Pattern Table
Pattern
Constant Green
Fast Flashing Green
Long Green - Short Red
Short Green - Short Red
Short Green - Long Orange
Long Orange Flash
Fast Flashing Orange
Fast Flashing Red
No Light
* Spool may have resulted from Paper Out or Head Up conditions)
No hardware power switch is fitted, as power control is either automatic or by command
from the host computer. To save power, the printer enters sleep mode after a period of
inactivity, factory-set to 30 seconds, but prorammable from the host. It can also be
programmed to stay idle indefinitely or to go to sleep on command.
The Ap1300 utilizes Fujitsu FTP-628MCL 103 printer mechanism, with a fixed (parallel)
print head with 384 horizontally-arranged thermal elements. A stepper motor advances
the paper and the printing takes place in a single-dot row for each step of the paper. Each
printed dot is approximately 1/8 mm square. The printing speed and dot density are
controlled according to the battery voltage and the head temperature.
The Spot Vital Signs LXi provides two levels of power to fast-charge or to float the battery
at fixed voltages using software control. The fast-charge level rapidly brings the battery
Ready to accept data, but no data are in the buffer
awaiting printing and the printer motor is not running.
Effectively switched off.
Active, but storing data for later printing.
Battery
Running
Running
Battery Low
Battery Low
Trickle Charging
Trickle Charging
Fast charging
Error Condition
Flat or in sleep mode
Welch Allyn Spot Vital Signs LXi
Buffer Mode
Normal
Spool *
Normal
Spool *
Normal
Spool *
Spool (Printing prohibited)
Spool (Printing prohibited)