User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06
Section 5 – Administration and maintenance messages 2015-04-20
Page50
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message 16 Remote self-test request
Format: <SI>16<SO>[LRC]
Message length: Fixed 5 bytes.
Usage: This message is used to ensure that the PP791 attached to the HOST is working
normally. PP791 will response an ACK (or NAK if LRC incorrect) within one second. If
multiple tests failed, response code will concatenate such as “<SI>16125<SO>”.
Message element:
Request frame (HOST to PIN Pad)
Field Length Value and description
<SI> 1 <0F>
16 2 Message ID
<SO> 1 <0E>
[LRC] 1 Checksum
Response frame (PIN Pad to HOST)
Field Length Value and description
<SI> 1 <0F>
16 2 Message ID
[Response] 1 .. 3 0 – Healthy
1 – RAM test fail
2 – ROM checksum fail
5 – Master keys CRC error
<SO> 1 <0E>
[LRC] 1 Checksum
Message flow:
HOST Direction PIN Pad
Message 16
(Request frame)


<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)

Message 16
(Response frame)
<ACK>/<NAK>
/<EOT>


<EOT>