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
Page280
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message Q4 Enable/Disable Magnetic Card Reader
Format: <STX>Q4[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 magnetic card reader. Only
track 2 is enabled if [flag] field contains ‘0’. All tracks will be enabled if [flag] field
contains a ‘2’.
NOTE: Please refer to message 81 for returned magnetic card data format.
Message element:
Field Length Value and description
<STX> 1 <02>
Q4 2 Message ID
[flag] 1 ‘0’: enable Track2 only
‘1’: disable
‘2’: enable all tracks of MSR
<ETX> 1 <03>
[LRC] 1 Checksum
Message flow:
HOST Direction PIN pad
Message Q4


<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)