User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06

Section 11 – ICC / SAM / Magnetic stripe card manipulating messages 2015-04-20

Page286

Uniform Industrial Corp. Proprietary and Confidential Total 342 pages

Message QA Enable/Disable Contactless Card Reader

Format: <STX>QA[flag]<ETX>[LRC]

Message length: Fixed 6 bytes.

Usage: All the tracks are disabled by default (After each re-power on PIN pad). The HOST can

use this message to have PIN pad enable or disable the contact-less card reader. Only

track 2 is enabled if [flag] field contains ‘0’. Both tracks will be enabled if [flag] field

contains a ‘2’.

NOTE: Please refer to message 83 for returned magnetic card data format.

Note. QA message will set prefix <81>, <82> and <83> as prefix of track data 1, 2 and 3.

Message element:

Field Length

Value and description

QA 2 Message ID

[flag] 1 ‘0’: enable Track2 only

‘1’: disable

‘2’: enable all tracks of MSR

[LRC] 1 Checksum

Message flow:

HOST Direction PIN pad

Message QA





<ACK> (Good LRC)

<NAK> (Bad LRC)

<EOT> (after 3 NAKs)

(<EOT>Contactless card reader is initialized failed)