Rice Lake 920i Installation Manual V1.05 - Manual (Page 101)

Appendix 97
10.7 Data Formats
Continuous Output Serial Data Format
If continuous transmission is conÞgured 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
NOTE: If the scale capacity is exceeded, the weight data field
is replaced with >>>>>>> characters. If the display capability
of the indicator is exceeded, the weight field is replaced with
VERFLOW ("overflow"). Both errors set the status data
field to "I".
Demand Output Serial Data Format
When demand mode is conÞgured 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 conÞguration.
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 47 for
more information on custom print formats.
RS-485 Data Formats
Two-wire RS-485 communications is available on
p o r t 3 o f t h e C P U b o a r d ; f o u r- w i r e R S - 4 8 5
communications is supported on the ÒAÓ 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
r a n g e 1 Ð 2 5 5 ; t h e a d d r e s s i s s p e c i Þ e d o n t h e
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 ÒAÓ.
¥ 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:
A SCALE #1
GROSS 1699 LB
08/20/1998 10:05 AM
If continuous transmission is conÞgured for the serial
port, the
920i sends data using the data format shown
in Figure 10-5:
Figure 10-5. RS-485 Continuous Data Format
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
or
ASCII 02
decimal
Address of the
receiving indicator
EDP serial command
NOTE: Host must send , not
. Failure to use
renders all indicators unable to
respond to serial commands
ASCII
13 decimal
ASCII 02
decimal
Address of the
transmitting indicator
Response commands from
indicator:
<first line>
<additional lines>
<last line>
where EOL = or
(set by TERMIN parameter on the
SERIAL menu) ASCII 13
decimal
ASCII 03
decimal
Response commands from
indicator:
NOTE : This is the Consolidated
Controls continuous data format ASCII 02
decimal
Address of the
transmitting indicator
ASCII 13
decimal
ASCII 03
decimal