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AbbreviatedTransmission
Byte Description
1-12 12 byte data field, 10 bytes for number, one byte for
sign, one byte for decimal point
13 <CR> (carriage return)
14 <LF> (line feed)
15 <SP>* (Space)
16 <CR>* (carriage return)
17 <LF>* (line feed)
* These characters only appear in the last line of a block print.
The abbreviated response suppresses the node address and register ID,
leaving only the numeric part of the response.
Meter Response Examples:
1. Node address = 17, full field response, Counter A = 875
17 CTA 875 <CR><LF>
2. Node address = 0, full field response, Setpoint 1 = -250.5
SP1 -250.5<CR><LF>
3. Node address = 0, abbreviated response, Setpoint 1 = 250, last line of block
print
250<CR><LF><SP><CR><LF>
Command Response Time
The meter can only receive data or transmit data at any one time (half-duplex
operation). During RS232 transmissions, the meter ignores commands while
transmitting data, but instead uses RXD as a busy signal. When sending
commands and data to the meter, a delay must be imposed before sending
another command. This allows enough time for the meter to process the
command and prepare for the next command.
At the start of the time interval t 1 , the computer program prints or writes the
string to the com port, thus initiating a transmission. During t 1 , the command
characters are under transmission and at the end of this period, the command
terminating character (* or $) is received by the meter. The time duration of t 1
is dependent on the number of characters and baud rate of the channel.
t 1 = (10 times the # of characters) / baud rate
At the start of time interval t 2 , the meter starts the interpretation of the
command and when complete, performs the command function. This time
interval t 2 varies. If no response from the meter is expected, the meter is ready
to accept another command.
If the meter is to reply with data, the time interval t 2 is controlled by the use
of the command terminating character. The ‘*’ terminating character results in a
response time of 50 msec. minimum. This allows sufficient time for the release
of the sending driver on the RS485 bus. Terminating the command line with ‘$’
results in a response time (t 2 ) of 2 msec. minimum. The faster response time of
this terminating character requires that sending drivers release within 2 msec.
after the terminating character is received.
At the beginning of time interval t 3 , the meter responds with the first
character of the reply. As with t 1 , the time duration of t 3 is dependent on the
number of characters and baud rate of the channel. At the end of t 3 , the meter is
ready to receive the next command.
t 3 = (10 times the # of characters) / baud rate
The maximum serial throughput of the meter is limited to the sum of the
times t 1 , t 2 and t 3 .
NO REPLY FROM METER
Command Meter
String Response
Transmission Time
Ready t 1 t 2 Ready
RESPONSE FROM METER
Ready t 1 t 2 t 3 Ready
Reply
Transmission
Time
Timing Diagram Figure
15
Communication Format
Data is transferred from the meter through a serial communication channel.
In serial communications, the voltage is switched between a high and low level
at a predetermined rate (baud rate) using ASCII encoding. The receiving device
reads the voltage levels at the same intervals and then translates the switched
levels back to a character. The voltage level conventions depend on the interface
standard. The table lists the voltage levels for each standard.
LOGIC INTERFACE STATE RS232* RS485*
1 mark (idle) TXD,RXD; -3 to -15 V a-b < -200 mV
0 space (active) TXD,RXD; +3 to +15 V a-b > +200 mV
* Voltage levels at the Receiver
Data is transmitted one byte at a time with a variable idle period between
characters (0 to ∞ ). Each ASCII character is “framed” with a beginning start bit,
an optional parity bit and one or more ending stop bits. The data format and
baud rate must match that of other equipment in order for communication to
take place. The figures list the data formats employed by the meter.
Character Frame Figure
Start Bit and Data Bits
Data transmission always begins with the start bit. The start bit signals the
receiving device to prepare for reception of data. One bit period later, the least
significant bit of the ASCII encoded character is transmitted, followed by the
remaining data bits. The receiving device then reads each bit position as they are
transmitted.
Parity Bit
After the data bits, the parity bit is sent. The transmitter sets the parity bit to
a zero or a one, so that the total number of ones contained in the transmission
(including the parity bit) is either even or odd. This bit is used by the receiver to
detect errors that may occur to an odd number of bits in the transmission.
However, a single parity bit cannot detect errors that may occur to an even
number of bits. Given this limitation, the parity bit is often ignored by the
receiving device. The CUB5 meter ignores the parity bit of incoming data and
sets the parity bit to odd, even or none (mark parity) for outgoing data.
Stop Bit
The last character transmitted is the stop bit. The stop bit provides a single bit
period pause to allow the receiver to prepare to re-synchronize to the start of a
new transmission (start bit of next byte). The receiver then continuously looks
for the occurrence of the start bit. If 7 data bits and no parity is selected, then 2
stop bits are sent from the meter.
LIMITED WARRANTY
The Company warrants the products it manufactures against defects in materials and
workmanship for a period limited to two years from the date of shipment, provided the
products have been stored, handled, installed, and used under proper conditions. The
Company’s liability under this limited warranty shall extend only to the repair or
replacement of a defective product, at The Company’s option. The Company disclaims
all liability for any affirmation, promise or representation with respect to the products.
The customer agrees to hold Red Lion Controls harmless from, defend, and indemnify
RLC against damages, claims, and expenses arising out of subsequent sales of RLC
products or products containing components manufactured by RLC and based upon
personal injuries, deaths, property damage, lost profits, and other matters which Buyer,
its employees, or sub-contractors are or may be to any extent liable, including without
limitation penalties imposed by the Consumer Product Safety Act (P.L. 92-573) and
liability imposed upon any person pursuant to the Magnuson-Moss Warranty Act (P.L.
93-637), as now in effect or as amended hereafter.
No warranties expressed or implied are created with respect to The Company’s products
except those expressly contained herein. The Customer acknowledges the disclaimers
and limitations contained herein and relies on no other warranties or affirmations.
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