User's Manual

RS232-Transponder Reader
(SECS1-Protocol), Release 0.3 Draft Page 79 of 91
2000-09-29
ID: ID000093
9.6.5 S18F5: READ REQUEST (RR) (host -> reader, reply)
The host requests the subsystem indicated in TARGETID to read information.
DATASEG may be used to indicate a specific section of data to be read.
DATALENGTH is used to limit the amount of data for that section.
S18F5 W
L,3
1. A,8 <TARGETID>
2. A,2 <DATASEG>
3. UI2 <DATALENGTH>
If DATASEG and DATALENGTH are both omitted (zero length items) then all data
is requested. If only DATALENGTH is omitted, then all data within the indicated
section are requested.
9.6.6 S18F6: READ DATA (RD) (reader -> host)
This message is used to return requested information from the subsystem indicated
in TARGETID or to acknowledge the result of the request.
S18F6
L,3
1. A,8 <TARGETID>
2. A,2 <SSACK>
3. A,8 <DATA>
If TARGETID is unknown, then DATA is zero length.
9.6.7 S18F7: WRITE DATA REQUEST (WAR) (host -> reader, reply)
This message requests to write data to the subsystem component indicated in
TARGETID. DATASEG may be used to indicate a specific section of data to be
written or overwritten.
S18F7 W
L,4
1. A,8 <TARGETID>
2. A,2 <DATASEG>
3. UI2 <DATALENGTH>
4. A,8 <DATA>