CBLUSB01 datasheet(28/36 Pages) REDLION

28 / 36 page

Abbreviated Transmission

Byte

Description

1-12

12 byte data field, 10 bytes for number, one byte for sign,

one byte for decimal point

<CR> carriage return

<LF> line feed

<SP>* (Space)

<CR>* carriage return

<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, Input = 875

17 INP

875 <CR><LF>

2. Node address = 0, full field response, Setpoint 2 = -250.5

SP2

-250.5<CR><LF>

3. Node address = 0, abbreviated response, Setpoint 2 = 250, last line of block

250<CR><LF><SP><CR><LF>

(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

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

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