Output Format; Interface - Welch Allyn Spot Vital Signs LXi Service Manual

Service Manual

Output Format

The data accepted as a valid bar code reading consists of an ASCII text string composed
of three elements: the prefix, the message consisting of the bar code data, and the suffix.
The format of the string is as follows:
"<STX><SOH><DC2>AA...AA(CR><LF>"
where:
Field
STX
SOH
DC2
A
CR
LF
Note

Interface

The bar code scanner interfaces to Spot Vital Signs LXi through an isolated RS-232 DB-9
female connector. A started 3800LR-13 or 4600SF031C cable (Part #42204253-01 RS232,
9PIN D, HHP 0204 REF F) is required for use with the scanner.
1. Spot Vital Signs LXi issues a single beep for valid bar codes and displays the
message scanned in on the units display. If a bar code is invalid, Spot Vital
Signs displays nothing.
2. Spot Vital Signs LXi treats bar codes longer than 20 characters as invalid.
3. Spot Vital Signs LXi checks the parity bit of every character received. If a
parity error is detected in the preamble, Spot Vital Signs LXi ignores the
remainder of the bar code (no beep issued). If a parity error is detected in
the message data or suffix, Spot Vital Signs LXi treats the bar code as
invalid.
4. Refer to the bar code scanner manual for a list of supported symbologies.
Description
Start of Text character, 0x02.
Start of Header character, 0x01.
Device Control 2 character, 0x12.
Message data consisting of alpha-
numeric chacters in the range 0x20
through 0x7E. The message length can
range from 0 to 20 characters.
Carriage return character, 0x0D.
Line feed character, 0x0A.
Technical Overview 67