CBLUSB01 datasheet(27/36 Pages) REDLION

27 / 36 page

(CSR) Control Status Register

The Control Status Register is used to both directly control the meter’s

outputs (setpoints and analog output), and interrogate the state of the setpoint

outputs. The register is bit mapped with each bit position within the register

assigned to a particular control function. The control function are invoked by

writing to each bit position. The bit position definitions are:

Although the register is bit mapped starting with bit 7, HEX < > characters

are sent in the command string. Bits 7 and 5 always stay a zero, even if a “1” is

sent. This allows ASCII characters to be used with terminals that may not have

extended character capabilities.

Writing a “1” to bit 4 of CSR selects manual mode. In this mode, the setpoint

outputs are defined by the values written to the bits b0, b1, b2, b3; and the

analog output is defined by the value written to the AOR. Internal control of

these outputs is then overridden.

In automatic mode, the setpoint outputs can only be reset off. Writing to the

setpoint output bits of the CSR has the same effect as a Reset command (R). The

contents of the CSR may be read to interrogate the state of the setpoint outputs

and to check the status of the temperature sensor (PAXT only).

Examples:

1. Set manual mode, turn all setpoints off:

V is command write, J is CSR and * is terminator.

2. Turn SP1, SP3 outputs on and SP2, SP4 outputs off:

3. Select Automatic mode:

Note: Avoid writing values <0A> (LF), <0D> (CR), <24> ($) and <2E> (*)

to the CSR. These values are interpreted by the meter as end of command

control codes and will prematurely end the write operation.

(AOR) Analog Output Register

The Analog Output Register controls the analog output of the meter. The

manual mode must first be engaged by setting bit 4 of the Control Status

0 mA, 0 V and 20 mA, 10 V; respectively. The table lists correspondence of the

output signal with the register value.

*Due to the absolute accuracy

rating and resolution of the output

card, the actual output signal may

differ 0.15% FS from the table

values.

The

output

signal

corresponds to the range selected

(20 mA or 10 V).

Writing to this register while the meter is in the manual mode causes the

output signal to update immediately. While in the automatic mode, this register

may be written to, but the output will not update until the meter is placed in

manual mode.

Examples:

1. Set output to full scale:

VI4095*

2. Set output to zero scale:

VI0*

bit 0: Setpoint 1 Output Status

0 = output off

1 = output on

bit 1: Setpoint 2 Output Status

0 = output off

1 = output on

bit 2: Setpoint 3 Output Status

0 = output off

1 = output on

bit 3: Setpoint 4 Output Status

0 = output off

1 = output on

bit 4: Manual Mode

0 = automatic mode

1 = manual mode

bit 5: Always stays 0, even if 1 is sent.

bit 6: Sensor Status (PAXT only)

0 = sensor normal

1 = sensor fail

bit 7: Always stays 0, even if 1 is sent.

SERIAL COMMANDS FOR PAX SOFTWARE

7 6 5 4 3 2 1 0:bit location

VJ<30>* or VJ0*

ASCII 0 = 0 0 1 1 0 0 0 0 or <30>

VJ<35>* or VJ5*

or <35>

ASCII 5 =

0:bit location

VJ<40>* or VJ@*

or <40>

ASCII @ =

0:bit location

Command Response Time

The meter can only receive data or transmit data at any one time (half-duplex

operation). 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 t1, the computer program prints or writes the

string to the com port, thus initiating a transmission. During t1, the command

characters are under transmission and at the end of this period, the command

terminating character (*) is received by the meter. The time duration of t1 is

dependent on the number of characters and baud rate of the channel.

t1 = (10 * # of characters) / baud rate

At the start of time interval t2, the meter starts the interpretation of the

command and when complete, performs the command function. This time

interval t2 varies from 2 msec to 50 msec. 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 t2 is controlled by the use

of the command terminating character. The standard command line terminating

character is ‘*’. This terminating character results in a response time window of

50 msec minimum and 100 msec maximum. 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 window (t2) of 2 msec minimum and 50 msec

maximum. 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 t3, the meter responds with the first

character of the reply. As with t1, the time duration of t3 is dependent on the

number of characters and baud rate of the channel. t3 = (10 * # of characters) /

baud rate. At the end of t3, the meter is ready to receive the next command.

The maximum serial throughput of the meter is limited to the sum of the

times t1, t2 and t3.

Ready

Command

String

Transmission

Meter

Response

Time

Command

Terminator

Received

First

Character

of Reply

Transmission

NO REPLY FROM METER

RESPONSE FROM METER

Time

Timing Diagram Figure

Output Signal*

I (mA)

V (V)

0.000

0.005

0.0025

5.000

10.000

2047

4094

19.995

9.9975

10.000

20.000

4095

CBLUSB01 数据表(PDF) 27 Page - Red Lion Controls. Inc

CBLUSB01 数据表(HTML) 27 Page - Red Lion Controls. Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

数据表下载

链接网址

CBLUSB01 数据表(PDF) 27 Page - Red Lion Controls. Inc

CBLUSB01 数据表(HTML) 27 Page - Red Lion Controls. Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

数据表 下载

链接网址

数据表下载