PCB Piezotronics 482C27, General Operations Manual

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MULTICHANNEL SIGNAL CONDITIONER MODEL 482C27 GENERAL OPERATION MANUAL
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LEDS FCN Unit Front panel LED test function
RSET FCN Unit Restores factory default channel settings
AUTR FCN Channel Enable/disable auto-scaling function
SAVS FCN Unit Saves the current settings to NVRAM
Command type definitions;

R/W – the setting can be read from or written to the unit or channel.

R – The information can only be read from the unit or channel.

FCN
– The command invokes a function in the unit.
4-9. Command Format
The 482C27 communication protocol incorporates the concept of 'Directed' and 'Global' commands at both the Unit and
Channel level with the following characteristics;

Unit or Channel numbers =0 are global commands that affect either all units or all channels of a particular unit
or both.

Directed commands that set a unit parameter are always acknowledged (ACK) with an ASCII message that
indicates '<Unit#>:<CMD>:ok’ if implemented with no errors or NAK with; <Unit#>:<CMD>:=<error#>’ if
an error was encountered.

Directed commands that request a particular parameters setting (query) result in a query response being
returned

No response is ever given to a Global Unit command.

All messages must be terminated with a <CR> (\r) and <LF> (\n) combination.
Command Format :
'Unit#:Ch#:Cmd[=|?]{<value1 >{,< value2 >}}{;Ch#:Cmd[=|?]{<value1>{,< value2>}}}\n\r

Each message must be preceded by a Unit# & Channel# (both of which could be 0)

Messages may contain multiple commands separated by a semicolon ‘;’.

The second and subsequent commands in a message shall not contain a unit number but shall contain a channel
number.

Each command in a message will evoke a response message if one is warranted (not global)

Query’s ('?') can only be directed to one unit but if the channel=0 then each channel's setting will be returned in
the order 0-MAXCHANNELS separated by a ':'
Command examples :
1:0:GAIN=100.2\r\n unit 1,all channels gain set to 100.2
1:1:GAIN=100.2;2:GAIN=120.3\r\n unit 1, channel 1 gain = 100.2; channel 2 gain = 120.3
1:3:GAIN=100.2;0:FLTR=1\r\n
unit 1, channel 3 gain = 100.2; all channel’s filter = ON
General Query Response Format
Unit#:Cmd:Ch#=<value>{; Ch#=<value>}…>{; Ch#=<value>}…\r\n
Responses to a query with a channel number=0 will return the setting of each channel in a list separated by
semicolons ‘;’.
If the target of the query is a unit setting (ex. current excitation) then the channel number returned is the 1
st
channel of the board that processed the command.