31
31
english
Function Description BIS M-81_ / PC
Reading / Writing over the serial interface
There are specific telegrams for the individual operations in the BIS M-81_ Handy Program-
mer. They always begin with the command which corresponds to the telegram type:
'L'
Read data carrier
'P'
Write to data carrier
'C'
Write a constant value to the data carrier
'Q'
Restart Handy Programmer (Quit)
'Z'
Initialize data carrier for CRC_16 data check
Please note:
– Continuous querying on the interface is not permitted!
– The minimum wait time between two commands is 300 ms!
Telegram types
with associated
command
(ASCII)
M-81_854610_E_0703.p65
32
english
32
Function Description BIS M-81_ / PC
Reading / Writing over the serial interface
Explanation of
selected telegram
contents
Start address and
The start address (A3, A2, A1, A0) and the number of bytes to send
no. of bytes
(L3, L2, L1, L0) are transmitted as ASCII characters. For the start address
a range of 0000 to 1999 and for the number of bytes 0001 to 2000 can
be used. A3 ... L0 stand for 1 ASCII character each.
Please note:
Start a number of bytes may not exced the
data carrier capacity.
Acknowledgement The <ACK> '0' is sent by the identification system if the serially
transmitted characters were correctly recognized and a data carrier is
within the active zone of a read/write head.
<NAK> + 'Error No.' is sent as an acknowledgement if an error is detected
or if there is no data carrier within the active zone of a read/write head.
Start
<STX> starts data transmission.
Bytes
The data are transmitted code-transparent (not converted).
sent
