Salto WRADAPT - 9 Formats; 9.1 RS232 format with STX, ETX and Checksum

Desktop Reader Manual V2.1
26/02/2007
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The baud rate, the number of bits (7 or 8) and the parity (N, E, O) are selected in the MODE dipswitch.
8.2 OMRON interface
The OMRON interface emulates the magnetic card readers. The OMRON interface has two outputs: Clock
and Data. The Clock and Data outputs in standby are 5 volts. The Data line is negated: 5 volts for a
logical Zero and 0 volts for a logical One.
The bit time is 150 us. The Clock remains in the low state 50 us. The Data line has the valid level 50 us
before the falling edge of the Clock and is kept valid 50 us after the rising edge of the Clock. So, the
terminals can read the Data with the falling or with the rising edge of the Clock, as they prefer. The
speed is comparable with magnetic card readers reading tracks of 75 and 210 bpi.
8.3 WIEGAND interface
The Wiegand interface has two outputs: Data0 and Data1. In standby they have 5 volts through 1
Kohms resistor. They represent the corresponding logical level giving a 0 volts pulse (0.4 volts through
47 ohms resistor). The width of the pulse is 90 us and the interval between pulses is 1 ms.
9 Formats
The data can be sent using different encoding tables and adding in some cases control characters and
checksums. Some formats are specific for only one interface, others are common to various interfaces.
9.1 RS232 format with STX, ETX and Checksum
The transmitted characters are all printable ASCII characters except 2 control characters that helps to
determine where the message starts and finishes:
STX 0x02 Start of message
ETX 0x03 End of message
The frame of the message is:
STX DATA ETX Checksum
0x02 N characters 0x03 1 byte
The Checksum is calculated as the OR Exclusive of all the previous bytes including the STX and ETX. If
the manufacturer of the external device wants to simplify the software can skip the Checksum testing.
Depending on the source of data the N characters of the DATA are:
• Track1, Track2, Track3: exactly the same string of ASCII characters given by the PMS to the
HAMS through the Track command.
• ROM14: ROM code of the key expressed as 14 hexadecimal ASCII characters. Each byte of the
ROM Code is expressed with two ASCII hex characters. A Start Sentinel (“%”) and End Sentinel
(“?”) are added.
9.2 RS232 Plain Format
It transmits the ASCII characters of Data without STX, ETX and Checksum.
9.3 OMRON Formats: BCD and ALPHA
The ASCII characters of Data have to be translated to BCD or ALPHA codes (see BCD and ALPHA ISO
)
before be sent through the OMRON interface. This format is also availabe for Wiegand.
9.3.1 BCD or ALPHA format
The standard specifies BCD encoding for Track2 and Track3 and ALPHA encoding for Track1 but it is
usual that applications do not follow this rule. To permit these exceptions, the encoding is not selected