User's Manual

May ’00 Chapter 2. Communications Protocol

Command Field (2)

Command Field (2) is only present if bit 7 of Command Byte 1 is set.

Bit Use Setting Comment

0 Special Write Timing 1/0 If set, needs to be determined in Data Field

(see 2.1.4)

1 Wireless Synchronization 1/0 If set, wireless synchronization is used

2 DBCC calculation 1/0 If set, Micro-reader calculates DBCC of the

R/W and MPT write data

3-7 Reserved

If Command Field (2) is not present, standard TIRIS write timings are used and wire-

less synchronization is switched on/off according to the status of input line WLSC.

2.1.4 Data Field

The presence of the relevant data field depends on the setting of the bits in the Com-

mand Field.

If the relevant bit (for example: Command bit 3 “Power Burst I”) is set to “1”, then Data

Field 1 is present defining the Power Burst length. If the relevant bit in the Command

Field is set to “0” the consequent Data Field is omitted, this results in the following

data field being moved forward (decremented) by one.

Data

Field Use Range (dec) Comment

1 Power Burst I 1..255 ms If bit 3 of Command Field(1) is set

2 Power Pause Duration 1..255 ms If bit 4 of Command Field(1) is set

3 Power Burst II 1..255 ms If bit 5 of Command Field(1) is set

4/5 toffLow (LSByte/MSByte) 28..2044 ms If bit 0 of Command Field(2) is set

6/7 tonLow (LSByte/MSByte) 28..2044 ms If bit 0 of Command Field(2) is set

8/9 toffHigh (LSByte/MSByte) 28..2044 ms If bit 0 of Command Field(2) is set

10/11 tonHigh (LSByte/MSByte) 28..2044 ms If bit 0 of Command Field(2) is set

12 # of Data Fields that follow see * If bit 6 of Command Field(1) is set

13 . . Data Fields LSByte first

* The number of Data Fields must not cause an infringement of the total number

of bytes allowed within a protocol frame.

Transponder command protocols are described in detail in section 4.1.

Note:

The settings specified in Command Field (1) and (2) are only valid

during the execution of the current command.

Example:

Hex

= 0000 0110

BIN

0 0 0 0 0 1 1 0

No Special Write Timing

Wireless Synchronization is used

Micro-reader calculates DBCC

Bits 3-7 reserved