Baumer N 155 - Manual (Page 6)

N 155
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4. Description of commands
4.1 General information
The following is describing the individual interface commands broken down into the four groups below:
- operating commands [ commands required during operation ]
- parameter commands [ commands serving for parameterization ]
- identifier commands [ commands for indication or alteration of the device identifier (address)]
- specific commands [ commands for specific functions as device reset or read version number]
The following abbreviations will be applied:
SOH = Start of header (header token)
EOT = End of transmission (footer token)
Adr = device identifier including offset 20h
Cmd
= Command
data = data being sent or received
4.2 Operating commands
4.2.1 Read current value „R“ (52h)
This command is for reading the 5-digit current value (lower display line). Data volume is always 6 bytes. In case
of a negative value, the negative “-“ sign (2Dh) together with 5 data bytes will be returned. Positive values are
depicted by 6 data bytes without sign. Values of less than 5 (4) digits will come with preceding zeroes. Please
note that the current value is always of 5 digits (refer also to chapter “Special features in data transfer”).
Example 1: Read current value (current value = -32.50
SOH Adr Cmd EOT CRC
Send
01h 20h 52h 04h 40h
SOH Adr Cmd current value = -32.50 EOT CRC
Response
01h 20h 52h 2Dh 30h 33h 32h 35h 30h 04h 54h
Example 2 Programming the current value (new current value = 75.50)
SOH Adr Cmd current value = 75.50 EOT CRC
Send
01h 20h 52h 30h 30h 37h 35h 35h 30h 04h C9h
SOH Adr Cmd current value = 75.50 EOT CRC
Response
01h 20h 52h 30h 30h 37h 35h 35h 30h 04h C9h
4.2.2. Read / write target (profile) „S“ (53h)
This command is for reading the presently active target or for programming respectively reading a specific tar-
get. The data are composed of profile number (2 bytes) and target (6 bytes). Important: Negative targets are
transferred as 5 digit numbers (see example no. 3). Please consider that the targets are always of 5 digits only.
Example 1: Read active target (current profile number = 12; target = 12.50)
SOH Adr Cmd EOT CRC
Send
01h 20h 53h 04h 2Ah
SOH Adr Cmd Profil-Nr. = 12 target = 12.50 EOT CRC
Response
01h 20h 53h 31h 32 30h 30h 31h 32h 35h 30h 04h 3E
Response upon clearing all targets:
SOH Adr Cmd Profil-Nr. = FFh target = FFFFFFh EOT CRC
Response
01h 20h 53h 3Fh 3Fh 3Fh 3Fh 3Fh 3Fh 3Fh 3Fh 04h 2Ah