PX 30 and PX 120 Operating Manual
3-31
Serial Drive
Monitor Mode
Display mode is active when the unit is switched on. If several PX-units are networked
together, they cannot be operated in monitor mode.
To activate monitor mode you will need to send the following telegram:
Start byte
0A
H
Slave Address / ID
Data length, low byte
01
H
Data length, high byte
00
H
Data (1)
90
H
CRC
End byte
0D
H
Communication Protocol
1-byte data pieces are processed in monitor mode. These are either:
• Representable characters from the IBM character set, which will be displayed at the
current cursor position OR
• Characters with control functions (control codes).
The control codes are listed on pages 7-3/7-4.
The 1-byte data pieces can be sent from the host to the PX-unit either individually or in a
package. The text display will respond to each of these send telegrams with a positive or
negative acknowledgement.
Communication Protocol for individual data
Host:
1-byte data (IBM/ASCII)
PX 30/120:
positive acknowledgement:
06H (ASCII: ACK)
negative acknowledgement:
15H (ASCII: NAK)
HOST
PX 30/120
1 1-Byte Data
2 ACK or NAK
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