3-22
Driving the Display
PX 30 and PX 120 Operating Manual
Serial Drive
Display Mode
Display mode is active when the unit is switched on.
Information from the controller is transmitted to the display in send telegrams. Each send
telegram is followed by a receive telegram, in which the text display responds with a
positive or negative acknowledgement.
Data Communication Protocol
With serial drive, the following data communication protocol must be adhered to:
Telegram begins (= 0A )
Target address (1 ... 31)
Data length (Low Byte)
Data length (High Byte)
Data for PX-unit
Check sum
Telegram ends (= 0D )
8 Bit
LF
Slave address ID ID-Signal (0 ... 7)
Data length low
Data length high
Data (1)
Data (DL)
CRC
CR
Data (2)
Data length (DL
H
H
The text display address (1 ... 31) should be coded in binary form in the 5 bits of the Slave
address. This address must correspond to the unit-address configured when the text
memory was programmed.
If the ID signal = 7, all the displays connected to the network will be called up, but only the
display with the transmitted slave address will respond. If the ID ≠ 7 (0 ... 6), there will be
no effect on the operation of the text display(s). The slave address/ID-Byte will be sent
back unchanged in the response telegram.
In the Bytes data length low and data length high, all the data for the PX-unit must be
contained in byte form between Data (1) and Data (DL).
The operating mode should be coded in Data (1).
Depending on which mode is selected, additional information should be transmitted in the
following bytes Data (2) to Data (DL) (see section entitled "Operating Modes", from page
3-23 onwards).
H
)
H
ID
low
high
ID-Signal (0 ... 7)
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