User's Manual

16
Micro-reader - Reference Guide May ’00
2.1.3 Command Field
The 'Command Field(s)' defines the mode in which the Micro-reader operates and
determines the operation that is to be carried out in the transponder. Depending on
the setting of the relevant bits, the corresponding information specified in the Data
Fields will be sent to the transponder or not. Thus all functions of each particular tran-
sponder type can be executed (see 2.1.4 for further information).
Command Field (1)
Bit Use Setting Comment
0/1 Mode/Cmd 00 Perform single command
(MSB,LSB) (for example: single read, program, lock)
01 Read in continuous Normal Mode
10 Read in continuous Line Mode
11 Send Micro-reader S/W version
2 FBCC calculation 1/0 If set, Micro-reader calculates FBCC of the
MPT protocol
3 Power Burst I 1/0 If set, needs to be determined in Data Field
(see 2.1.4)
4 Power Pause Duration 1/0 If set, needs to be determined in Data Field
5 Power Burst II 1/0 If set, needs to be determined in Data Field
6 Data 1/0 If set, needs to be determined in Data Field
7 Cmd expansion Field 1/0 If set, Command Field (2) follows
If bit 5 (Power Burst II, for example: for programming and locking) is set, the Micro-
reader automatically operates in single mode. Thus the user is enabled to validate
the programming or lock response before a further cycle is started.
If bit 2 (FBCC calculation) and bit 6 (Data) are set, the Micro-reader automatically cal-
culates a two byte BCC over the data to be sent to the transponder and adds it to the
protocol. When bits 2 and 6 are set the PC must not send the 2 byte FBCC to the
Micro-reader.
Bit 4 (Power Pause Duration) is for future use and must not be set when addressing
standard TIRIS transponders.
Example:
E8
Hex
= 1110 1000
BIN
1 1 1 0 1 0 0 0
Perform single command
No FBCC calculation
Power burst I value set in Data Field
Default set to 0
Power burst II value set in Data Field
Data values follows in Data Field
Command Field (2) follows