Pro-Active K531 - E2PROM configuration

About this document

This document provides information regarding the Pro-Active K531 OEM embedded software.

You will find a detailed description of the Pro-Active K531 hardware in the product datasheet.

Audience

This document is to be used by anyone wishing to build embedded electronic systems implementing the use of a ISO 144443 contactless interface.

History

Date Description
28/06/2004 Initial release
25/01/2007 Updated according to new specifications for version >= 1.40

Disclaimer

Changing startup parameters or RF configuration will dramatically change the module behaviour ! For example, when a different baudrate than default one is selected, you will not be able to communicate with the module using the default baudrate. Setting an invalid RF configuration may prevent communication with any or some kind of cards. Be sure to understand exactly what you're doing before writing into K531's non-volatile variables.

Overview

The startup parameters are stored in a 4-byte area of module's non-volatile memory (EEPROM). They can be read and writen using the "const" command in the module console, or through the SPROX_ReaderGetConsts / SPROX_ReaderSetConsts functions in the SpringProx API.

The RF settings are stored in a 4-byte area of module's flash memory (FEED). They can be read and writen only using the "feed" command in the module console.

Startup parameters

MSB LSB
B0 B1 B2 B3
Where :
Byte Name
B0 Basic configuration
B1 Address on bus
B2 Startup action
B3 RFU byte

Basic configuration (Byte 0)

msb lsb
b7 b6 b5 b4 b3 b2 b1 b0
RFU RFU KBD SBO SOD SEO BDR
Factory default :
00 (all bits cleared)
Where :
Bit Name Meaning
KBD Keyboard style output 1 : a 10ms delay is inserted between each chars in output (this is usefull when the device emulates an input device)
0 : no delay
SBO Serial Bus Option 0 : 2 wires serial communication (RS-232 or RS-422)
1 : 1 wire "bus" serial communication (RS-485 or alike)
SOD Serial OSI Disabled 0 : OSI protocol is allowed for host communication
1 : OSI protocol is disabled
SEO Serial Echo Off 1 : suppress the echo during serial console communication.
0 : keep the echo.
BDR Initial baudrate on startup 00 : 38400bps
01 : 115200bps
10 : 9600bps
11 : RFU

Address on Bus (Byte 1)

This byte allows to assign the device an address, for multi-nodes operation on an RS-485 bus.

When Address on Bus is between 01 and FE, the fast "bus" binary protocol is selected as described in K531 Developer's Guide.

Startup Action (Byte 2)

Instead of being a versatile conctactless device, involving high-level host-side development to interact with contactless cards at the application level, the K531 may also be used as a "dumb reader", just sending over the serial line the serial numbers (UIDs) of the cards it sees (see also the "poll" command in the module console).

The value in Startup Action defines the kind of card that will be looked for my the reader.

Note : you should definitively consider using a full featured reader (with advanced capabilities) such as IWM-K531 or IWM-K632 instead of using K531 in this mode.

msb lsb
b7 b6 b5 b4 b3 b2 b1 b0
Calypso RFU RFU RFU ASK CTS ST SR ISO B ISO A
Factory default :
00 (all bits cleared)
Where :
Bit Name Meaning
Calypso Read Calypso serial number Note : reading Calypso serial number is subject to a licence fee. Only devices holding the "C" mark in their reference are allowed to use this feature.
ASK CTS Read ASK CTS512 (and compliant) cards
ST SR Read ST MicroElectronics SR176 (and compliant) cards
ISO B Read ISO/IEC 14443-B card The number read is the PUPI (4 first bytes of ATQb).
ISO A Read ISO/IEC 14443-A card The number read is the UID (4, 7 or 12 bytes returned during the anticollision loop).

RFU (Byte 3)

This byte must be 00.

RF settings

RF settings are stored in FEED with address C1 and size 24 (hexadecimal) (36 in decimal). They are loaded at startup. Host-side software may alter those settings at runtime, but upon reset any change will be discarded.

Offset Description Default value
decimal hexa.
00 00 Conductance of the output amplifier (i.e. the amplitude of the field) 3F
01 01 Conductance during during the time of 14443-B modulation 0B
02 02 RxConfig register. Shoul'd be 01 01
03 03 RxWait register. Shoul'd be 06 06
04 04 BitPhase register. Shoul'd be 06 AD
05 05 Conductance during during the time of 15693 modulation 12
06 06 RFU 00
07 07 RFU 00
Transmitter configuration, 106 kbit/s
08 08 CoderControl register for 14443-A operation 19
09 09 CoderControl register for 14443-B operation 20
10 0A ModWidth register for 14443-A operation 13
Transmitter configuration, 212 kbit/s
11 0B CoderControl register for 14443-A operation 11
12 0C CoderControl register for 14443-B operation 18
13 0D ModWidth register for 14443-A operation 07
Transmitter configuration, 424 kbit/s
14 0E CoderControl register for 14443-A operation 09
15 0F CoderControl register for 14443-B operation 10
16 10 ModWidth register for 14443-A operation 03
Transmitter configuration, 848 kbit/s
17 11 CoderControl register for 14443-A operation 01
18 12 CoderControl register for 14443-B operation 08
19 13 ModWidth register for 14443-A operation 01
Receiver configuration, 106 kbit/s
20 14 RxControl1 register 77
21 15 DecoderThreshold register 08
22 16 RxThreshold register FF
23 17 BPSKDemControl register 00
Receiver configuration, 212 kbit/s
24 18 RxControl1 register 57
25 19 DecoderThreshold register 09
26 1A RxThreshold register F0
27 1B BPSKDemControl register 0C
Receiver configuration, 424 kbit/s
28 1C RxControl1 register 37
29 1D DecoderThreshold register 09
30 1E RxThreshold register F0
31 1F BPSKDemControl register 0C
Receiver configuration, 848 kbit/s
32 20 RxControl1 register 17
33 21 DecoderThreshold register 09
34 22 RxThreshold register F0
35 23 BPSKDemControl register 0C

Default values specified here are for K531 OEM module. CSB4 or other products may ship with different values. Please observe that appropriate values (especially for conductance and receive threshold) depend deeply on antenna characteristics (size, number of turns, tuning).

Do not try to change those values without an expert knowledge of the underlying physical phenomenons.