P61 firmware
© Nedap IDEAS, P.O. Box 103, NL-7140 AC GROENLO
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4 APPLICATION INFORMATION
The main function of the reader is to detect NEDAP transponders and to transmit its identification number
to a host computer. The id-number will be sent to the host in a so-called event message. A detailed
description of each event message is given in chapter 4.1.1.
Command messages allow a host computer to change settings in the reader or to request information from
the reader. The command messages are described in chapter 4.1.2.
4.1 DC2/DC4 PROTOCOL
DC2/DC4 protocol is the standard Nedap protocol which supports two-way communications, error checking
and software handshaking.
This chapter describes the application layer of the DC2/DC4 protocol as it is implemented in the P61
firmware. Refer to appendix C for a description of the DC2/DC4 protocol details.
4.1.1
EVENT MESSAGES
Event messages are messages that report to the host computer that a specific event has occurred inside
the reader. There are different types of event messages that may be send by the reader, like the detection
event that is sent when a transponder is identified.
Event messages, when they occur, are stored locally in the reader in the event buffer. Once
communication is idle the reader will try to transmit the event message. A maximum of 3 event messages
can be stored. When the event buffer is full a new event will overwrite the oldest one. The event buffer is
located in RAM memory and its contents will be lost when the power is off.
The reader may send the following event messages. Protocol dependant characters are not shown here.
Spaces are added for clarity.
Spaces are only added for readability.
O-event:
Reader restarted
Description:
The reader sends this event message as soon as the reader is powered-up to
indicate that the system is active. Application settings stored in EEPROM were
not lost.
Syntax:
01 01 01 20 O [????????]
Where:
[
????????
]
Optional unused timestamp. Can be enabled with command
message 0265.
Notes:
In case the P-event is sent the O-event is omitted.
P-event:
Reader reset
Description:
The reader sends this event message as soon as the reader is powered-up to
indicate that the system is active. Application settings stored in EEPROM were
reset to their factory default. EEPROM settings are not lost when the reader is
switched off. The EEPROM settings may be lost when the firmware is changed.
Syntax:
01 01 01 20 P [????????]
Where:
[
????????
]
Optional unused timestamp. Can be enabled with command
message 0265.
Notes:
In case the P-event is sent the O-event is omitted.
