Balluff BIS C-6 0 RS 232 Serie Handbuch Seite 56

C-6_0-007-00_836905_E_0704.p65
33
Dialog mode
with Head Select
Direct read mode
34
Telegram types
with associated
command
(ASCII)
34 english
Protocol
Read:
a) If no error:
Head
PLC
select
CT Present CT Present
BIS C-6_ _
OFF ON
t1 t2 t3
t1, t3, t7 > 0
t2 = max. 500 ms
t4 depending on no. of bytes to read
(see page 55/56)
b) With error:
Head
PLC
select
CT Present CT Present
BIS C-6_ _
OFF ON
t1 t2 t3
t1, t3, t5 > 0
t2 = max. 500 ms
BIS C-6_ _ CT Present ON Data
Data carrier in front of the
read/write head
t1
t1 depending on no. of bytes to read (see page 55/56)
Programming Information
The previous sections have described the basic telegram sequence and configuration. Follow-
ing is information on how to correctly construct telegrams.
There are specific telegrams for the individual operations in the BIS C identification system.
They always begin with the command which corresponds to the telegram type:
'L' Read data carrier with head and block size selection
'P' Write to data carrier with head and block size selection
'C' Write a constant value to the data carrier with head and block size selection
'R' Read data carrier
'W' Write to data carrier
'H' Select read/write head and block size with the variants
'?' Find next data carrier (one-time)
'!' or Find next data carrier (continuous)
'B' Process outputs
'Q' Restart processor (Quit)
'S' Check status message
'Z' Initialize CRC_16 data check
Please note:
– Continuous querying on the interface is not permitted!
– The minimum wait time between two commands is 300 ms!
Head
<STX>
mand deselect
<ACK>
Data
0
t4 t5 t6 t7
t5 > 0 (is not monitored by the processor)
t6 = max. 50 ms
Head
mand deselect
<NAK> Base
+ F-Nr. state
t4 t5
t4 depending on no. of bytes to read (see page 55/56)
and error type (recommended monitor time: 15 s)
Base
state
The examples are valid only if:
– The processor is in the base
state.
– A data carrier is present in front
of a read/write head.
Base
state
33
english