Data Output Formats
The data output formats for each data type (register number) are detailed below.
Register 00 - Remote Keyboard Mode.
The remote keyboard mode allows an external terminal device to communicate with the
Level Plus monitor and emulate the front panel keypad during programming operations
only. This allows users to modify programming data from remote locations or in areas
where access to the front panel keypad is not possible. During emulation mode, all dis-
play information is sent to both the Level Plus LCD display and the externally connected
terminal device. All programming menus are self prompting and the user only needs to
respond with the requested information in each programming menu. Valid terminal keys
for use with the keypad emulation mode are listed below.
Numeric keys 0,1,2,3,4,5,6,7,8,9
Alphanumeric keys M (Mode)
C (Clear)
F (Function)
Special keys ‘.’ (decimal key) and <CR> (Carriage return or Enter)
The data record output from the monitor during each screen update includes all the data
and necessary screen control characters to properly display on the terminal device screen.
An example output record is shown below.
<LF><CR>dddddddddddddddddddd<CR>dddddddddddddddddddd<CR>dddddddddddddd
dddddd<CR>dddddddddddddddddddd<LF><CR>aKBD><CR>
Where:
<LF> = ASCII line feed character (0A Hex)
<CR> = ASCII carriage return character (0D Hex)
a = Level Plus communication address (upper case ASCII A through S)
KBD> = Remote keyboard screen prompt
Registers 01 through 10 general format.
<STX>atrr:dddddddddd<ETX>cc
<STX> = ASCII start of text character (02 Hex)
a = Level Plus communication address
t = Tank number
rr = Register number
: = ASCII colon field delimiter (3A Hex)
d = Data (fixed at 1 data field of 10 characters)
<ETX> = ASCII end of text character (03 Hex)
cc = Optional 2 byte checksum (if enabled)
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