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

Page36

Uniform Industrial Corp. Proprietary and Confidential Total 342 pages

Message 05 Load Serial Number

Format: <SI>05[string]<SO>[LRC]

Message length: Variable, maximum length is 17 bytes

Usage: Load the PIN Pad with the serial number given in the message frame. PIN Pad will

send the whole message frame back to host as a confirmation of good reception. Host

should then send an <ACK> to confirm or <EOT> to cancel this serial number loading

process if the LRC is good but serial number echoed is incorrect. Follow the standard

<NAK> process if an invalid LRC is detected.

Message element:

Field Length

Value and description

05 2 Message ID

[string] 0..12 Alphanumeric string (0~9, A~Z, a~z)

[LRC] 1 Checksum

Message flow:

HOST Direction

PIN Pad

Message 05





<ACK> (Good LRC)

<NAK> (Bad LRC)

<EOT> (after 3 NAKs)



Message 05 (echo frame)

or <EOT> indicate error.

<ACK> (Good echo)

<NAK> (Bad LRC)

<EOT> (after 3 NAKs)





(Stores serial number)

<EOT>