PX 30 and PX 120 Operating Manual
3-23
The check sum CRC should be calculated as described in the section entitled "Example
for calculating check sum CRC" on page 3-30.
The PX-unit which was addressed will respond with a positive or negative acknowledge-
ment.
PX 30/PX 120 Response
The PX-unit which was addressed will respond to the telegram as follows:
• OA
H
ID 01
H
00
H
06
H
CRC 0D
H
Positive acknowledgement (06
H
)
• 0A
H
ID 01
H
00
H
15
H
CRC 0D
H
Negative acknowledgement (15
H
);
Transmission error
• OA
H
ID 04
H
00
H
15
H
00
H
xx xx CRC 0D
H
Negative acknowledgement (15
H
);
(xx xx ... 16-bit error number)
Error which triggers error message
"ERROR xxx" in the PX-unit
(xxx ... decimal error number; see
section entitled "Error Codes" on
page 7-4 of the Appendix)
A positive acknowledgement indicates that the text display has received the data without
error and has carried out the command. A negative acknowledgement indicates that the
data has not been received without error and/or the command has not been carried out.
Operating Modes
With the exception of Auto Display of text memory contents on/off and Status display
on), the same operating modes and special functions are available when driven in serial
as in parallel. Data communication must be carried out in accordance with the protocol
described above.
Important: Binary-coded values are interpreted as signed integers in serial drive as well
(see page 3-4)!
The operating modes available are:
Operating Mode
Hex-Code in Data (1)
Binary Code in Data (1)
Text Mode
50
01010000
Variable Mode
60
01100000
Special Mode
70
01110000
Activating Monitor Mode
90
10010000
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