Rice Lake 920i Installation Manual V3.12 - Manual (Page 121)

Appendix 115
10.8 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 10-2:
Figure 10-2. 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 6.0 on page 59 for
more information on custom print formats.
RS-485 Data Formats
Two-wire RS-485 communications is available on
port 4 of the CPU b oard; fo ur-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 10-3:
Figure 10-3. 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 a KPRINT command, the responding
indicator uses the format shown in Figure 10-4:
Figure 10-4. RS-485 Respond Data Format
Example:
To send the KPRINT command from an
ASCII terminal to an indicator at address 65 (decimal)
on the RS-485 network, use the format shown in
Figure 10-3.
• 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 KPRINT command to the
indicator at address 65, enter the following at the
terminal: CONTROL-B , A, K, P, R, I, N, T,
ENTER
.
The indicator responds with the format shown in
Figure 10-4:
<STX> A SCALE #1 <EOL>
GROSS 1699 LB<EOL>
08/20/1998 10:05 AM<EOL>
<ETX> <CR>
<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
<CR> <LF>
or <CR>
<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
<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