Rice Lake 920i USB Installation Manual V5.05 - Manual (Page 129)

Appendix 123
11.8 Data Formats
Continuous Output Serial Data Format
If continuous transmission is configured for a serial
port (STREAM parameter set to LFT or INDUST on
the SERIAL menu), the 920i sends data using the
Consolidated Controls serial data format shown in
Figure 11-2:
<STX> <POL> <wwwwwww> <UNIT> <G/N> <S> <TERM>
ASCII 02
decimal
Polarity:
<space> = Positive
<–> = Negative
Weight: 7 digits, right-justified, dummy
zeroes, decimal point with no leading
zeroes except for leading zero immediately
preceding the decimal point. Leading
zeroes transmitted as spaces.
L = pounds
K = kilograms
T = tons
G = grains
<space> = grams
O = ounces
G = Gross
N = Net
Status:
<space> = valid
I = Invalid
M = Motion
O = Over/under range
Z = Center of zero
<CR> <LF>
or <CR>
Figure 11-2. Continuous Output Serial Data Format
Demand Output Serial Data Format
When demand mode is configured for the serial port
(STREAM parameter set to OFF), the 920i uses a data
string formatted for a basic ticket printout. The
particular ticket format printed depends on the
indicator configuration.
You can customize the ticket to work with a wide
variety of printers, scoreboard displays, and other
remote equipment. See Section 7.0 on page 67 for
more information on custom print formats.
RS-485 Data Formats
Two-wire RS-485 communications is available on port
4 of the CPU board; four-wire RS-485 communications
is supported on the “A” ports of any installed serial
expansion cards.
The 920i has a built-in RS-485 software protocol
which is enabled when you assign a non-zero address
to the indicator. Valid RS-485 addresses must be in the
range 1–255; the address is specified on the ADDRESS
parameter on the SERIAL menu.
All remote commands are initiated using the data
format shown in Figure 11-3:
<STX> <ADDRESS> <COMMAND> <CR>
ASCII 02
decimal
Address of the
receiving indicator
EDP serial command
NOTE: Host must send <CR>, not
<CR><LF>. Failure to use <CR>
renders all indicators unable to
respond to serial commands.
ASCII
13 decimal
Figure 11-3. RS-485 Send Data Format
If the initiating device address matches the port address
of an 920i on the RS-485 network, that indicator
responds. For example, with demand outputs, or in
response to an XG#1 command, the responding
indicator uses the format shown in Figure 11-4:
<STX> <ADDRESS> <DEMAND DATA> <ETX> <CR>
ASCII 02
decimal
Address of the
transmitting indicator
Response commands from
indicator:
<first line> <EOL>
<additional lines> <EOL>
<last line> <EOL>
where EOL = <CR> or <CR> <LF>
(set by TERMIN parameter on the
SERIAL menu) ASCII 13
decimal
ASCII 03
decimal
Figure 11-4. RS-485 Respond Data Format
Example: To send the XG#1 command from an ASCII
terminal to an indicator at address 65 (decimal) on the
RS-485 network, use the format shown in Figure 11-3.
• The keyboard equivalent for the start-of-text
(
STX ) character is CONTROL-B .
• The indicator address (65) is represented by an
upper case “A”.
• The carriage return (CR) character is generated
by pressing the
ENTER key.
Therefore, to send the XG#1 command to the indicator
at address 65, enter the following at the terminal:
<CONTROL-B>AXG#1.
The indicator responds with the format shown in
Figure 11-4:
<STX>A 1234.00 lb<CR><LF><ETX><CR>