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Access keyboards ATB 420/421 Multi-Function Keyboard Product Specification and Service Guide
5. Data Format Protocol
The ATB420/421 has efficient RISC based micro-controller electronics allowing configurations to
be changed and down-loaded in the field. Access Keyboards can provide data format protocols to
user specification upon request.
5.1
Keyboard Data
All keyboard data is handled in accordance with industry standard Windows 104/105 keyboard data
protocol, command structure and code tables and the keyboard element communicates via the 6
pin mini-din interface. For further information refer to IBM Technical Reference Guide (Available on
request).
5.2
Host Port RS232C Settings
Data from the integrated MSR, Bar Code Port and Auxiliary RS232 port of the ATB420/ATB421 is
transmitted via the RS232 Host Interface in serial asynchronous format adhering to RS232C/V24
specifications.
Default Com Port Settings are
The ATBconfig.exe described in Section 3.1 allows selection of 19200 Baud. 8 Bit, No Parity is
also available.
5.3
RS232 Data Format
In the following descriptions hexadecimal values are represented by a four digit string in the form
0xxH where xx are values between 00 and FF. e.g. ASCII character A = 041H.
ASCII control characters are shown as the ASCII mnemonic enclosed with < >.
e.g. <STX> = 002H
The ASCII characters < > are always shown in their Hexadecimal equivalents if actually part of the
transmitted data.
Excluding keyboard data, data to and from the ATB420/421 is transmitted in the form of blocks.
An ASCII table is included as Appendix A
The following control characters are used to control and identify the flow of data across the RS232
link
___________________________________________________________________________
©
Rev 6
Access Keyboards 2001 & 2002 - All rights reserved
All manuals and user guides at all-guides.com
9600 baud
7 Bit
Even Parity
One stop Bit.
Page 20 of 37
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