Rice Lake 920i Installation Manual V4.01 - Manual (Page 124)

118 920i Installation Manual
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:
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
> = grams
O = ounces
G = Gross
N = Net
Status:
<space> = valid
I = Invalid
M = Motion
O = Over/under range
or
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 62 for
more information on custom print formats.
RS-485 Data Formats
Two-wire RS-485 communications is available on
p o r t 4 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 “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
r a n g e 1 – 2 5 5 ; t h e a d d r e s s i s s p e c i f i 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:
ASCII 02
decimal
Address of the
r eceiving indicator
EDP serial command
NOTE: Host must send , not
. Failure to use
renders all indicators unable to
respond to serial commands
ASCII
13 decimal
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 an XG#1 command, the responding
indicator uses the format shown in Figure 10-4:
ASCII 02
decimal
Addr ess 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
Figure 10-4. 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
R S - 4 8 5 n e t w o r k , u s e t h e f o r m a t s h o w n i n
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 XG#1 command to the
indicator at address 65, enter the following at the
terminal: AXG#1.
The indicator responds with the format shown in
Figure 10-4:
1234.00 lb