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B.2.0 Magnetic Card Read command strings

Six Commands strings are provided, to read the magnetic cards. These commands

are summarized in the tables below. The general syntax for commands is as follows:

Command String – General Syntax <ESC><’M’><n>< n> Track #CR

Command String - Example <ESC><’M’> ‘9’ ‘ 9’ 1 CR

Table B.1 – Magnetic Card Read Command Strings – general form

The ESC-M command turns on the power to the MC Reader•

The next two bytes, <nn> are used to set the MC reader’s timer. “01” through “99” •

are valid timer settings and “00” disables the timer.

The printer aborts and transmits the time-out error message, if the operator fails to •

swipe a card within the time period set by the host application.

On timeout printer aborts the swipe process, transmits timeout error message and •

turns off the <READING> LED.

A good magnetic card swipe automatically terminates the read process.•

Magnetic Card Command String Description

ESC – M - nn - 1 – CR (CR = Enter) Read Track1 only

ESC – M - nn - 2 – CR Read Track2 only

ESC – M - nn - 3 – CR Read Track3 only

ESC – M - nn - 4 – CR Read Track1 and Track2 simultaneously

ESC – M - nn - 5 – CR Read Track2 and Track3 simultaneously

ESC – M - nn - 6 – CR Read Tracks 1,2 and 3 simultaneously

ESC – C Cancel MC Read process

nn = ASCII “01” through “99” seconds

nn = “00” disables the MC reader timer

Table B.2 – Magnetic Card Read Command Strings - Details

B.3.0 Magnetic Card Data Output Format

The track data retrieved from a magnetic card is transmitted to the host in •

ISO7811 ASCII format as summarized in the table below.

The rst four characters (“%/1/”) ag the track number, the track data follows the •

ag string, terminated with ‘?’-CR-LF.

‘%;+’ are the track start sentinel characters, While ‘?’ is the end of track sentinel •

character.

If no data is available for a track that data eld will be empty. If an Error is •

encountered on any track a single ‘E’ will be the output for that tracks data eld.

Track1 Track 2 Track 3

%/1/ Data ?CRLF ;/2/ Data ?CRLF +/3/ Data ?CRLF

Table B.3 - ISO 7811 ASCII Format

B.4.0 Magnetic Card Read Error Messages

The characters <%> and <E> preface all error messages. Following these two

characters is a comma, the error number in ASCII (01 through 99), another comma,

English description of the error encountered and nally CR-LF terminating the <Error

Message> string. The syntax is as follows:

Error Message ( General Form) <%><E>, nn , Error text in ASCII, <CR> <LF>

Table B.4 – Error Message – General Form

Where nn is error number encountered. The printer may transmit Four (4) types of

Read Error messages. The following messages terminated with CR-LF are returned

by the rmware:

Error # Error Message Transmitted

05 Time-out Expired

07 Invalid Track Number

08 Unsupported Track Selected

09 Cancel Request

Table B.5 – Error Message – Specic Examples

1 2 ... 16 17 18 19 20 21 22 23 24 25 26

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