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Operating control interface units using the 3964R protocol
The number of bytes to be read out is limited by the maximum number
of bytes (256) in response and follow-up messages. If read head-no.
"X" is selected, 125 bytes can be read in each of two successful read
operations, 83 bytes in each of 3 and 62 bytes in each of four read ope-
rations.
Whenever "DLE" is sent, this further increases the volume of data. If the data output
exceeds 256 bytes, an error message is transmitted.
8.3
Error and status messages when using the 3964R protocol
Hex
Signification
Value
00
No error
01
Memory error in control interface unit after RAM test
02
Memory error in control interface unit after ROM test
03
Unable to understand command
04
Parity error in serial communication
05
Write error
06
Read head not connected or not ready
07
No code or data carrier is available, or an error has occurred during
data transfer between code or data carrier and control interface unit
08
Parity or CRC error during transmission with code or data carrier
09
Address or quantity of data outside valid range
0A
Programmable Array Logic (PAL) frozen in read head
0B
Watchdog reset
0C
Echo error in inductive transmission
0D
Function not available with the selected data carrier
0E
A read head of older technology is connected
0F
Synchronization error at nibble interface
10
Battery low (applies only to 8 and 32 Kbyte data carriers), but the com-
mand was executed successfully
11
Acknowledgment error in transmission to data carrier
12
Too much data for 2 messages
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
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