Ametek JOFRA ASC301 Manual de usuario

Remote Manual

Advanced Signal Calibrators

JOFRA ASC301 & ASC321

Remote Operation

The calibrator can be remotely controlled using a PC terminal, or by a

computer program running the calibrator in an automated system. It uses an

RS232 serial port connection for remote operation. With this connection the

user can write programs on the PC, with Windows languages like Visual

Basic to operate the calibrator, or use a Windows terminal, such as Hyper

Terminal, to enter single commands. Typical RS232 remote configurations

are shown in Figure 1.

Figure 1. Calibrator-to-Computer Connection

1. Setting up the RS232 Port for Remote Control

Note: The RS232 connection cable should not exceed 15m unless the load

capacitance measured at connection points is less than 2500pF.

Serial parameter values:

9600 baud

8 data bits

1 stop bit

no parity

Xon/Xoff

EOL (End of Line) character or CR (Carriage Return) or both

To set up remote operation of the calibrator on the Windows Hyper Terminal,

connected to a COM port on the PC as in Figure 1, use the following

procedure:

1. Start Hyper Terminal (located in Accessories/Communications of the

Windows Start menu)

2. Select New Connection.

Optional RS-232 or USB Cable

(See section 7.4)

COM PORT USB PORT

F1 F2 F3

ENTER

HOME

456

789

-0.

3. For Name enter ASC301. Select the serial port that the unit is connected

to.

4. Enter the above information for port settings.

5. Select ASCII setup from File/Properties/Settings and mark these

choices:

Echo typed characters locally

Wrap lines that exceed terminal width

6. Select Ok

7. To see if the port works enter *IDN?. This command will return

information on the unit.

2. Changing Between Remote and Local Operation

There are three modes of operation of the calibrator, Local, Remote, and

Remote with Lockout. Local mode is the default mode. Commands may be

entered using the keypad on the unit or using a computer. In Remote mode

the keypad is disabled, and commands may only be entered using a

computer, but choosing [GO TO LOCAL] from the menu on the calibrator

display will restore keypad operation. In Remote with Lockout, the keypad

can not be used at all. To switch modes proceed as follows:

1. To enable Remote mode, type in the serial command REMOTE at the

computer terminal.

2. To enable Remote with Lockout, type in REMOTE and LOCKOUT in either

order.

3. To switch back to local operation enter LOCAL at the terminal. This

command also turns off LOCKOUT if it was on. For more information on

commands refer to the Remote Commands section.

3. Using Commands

3.1 Command types

Refer to the Section on Remote Commands for all available commands.

The calibrator may be controlled using commands and queries. All

commands may be entered using upper or lower case. The commands are

divided into the following categories:

Calibrator Commands

Only the calibrator uses these commands. For example

LOWER_MEAS DCV

tells the calibrator to measure voltage on the lower display.

Common Commands

Standard commands used by most devices. These commands always

begin with an "*". For example

*IDN?

tells the calibrator to return its identification.

Query Commands

Commands that ask for information. They always end with a "?". For

example:

FUNC?

Returns the current modes of the upper and lower displays.

Compound Commands

Commands that contain more than one command on one line. For

example:

LOWER_MEAS RTD; RTD_TYPE CU10

Sets the calibrator to measure RTD in the lower display and sets RTD

type to Cu 10.

Overlapped Commands

Commands that require more time to execute than normal. The command

*WAI can be used after the overlapped command to tell the calibrator to

wait until the command finishes before executing the next command. For

example:

TRIG; *WAI

Triggers the pulse train. Once the pulse train has been triggered, the

calibrator can proceed to the next command.

Sequential Commands

Commands that are executed immediately after the are entered. This type

includes most of the commands.

3.2 Character Processing

The data entered into the calibrator is processed as follows:

• ASCII characters are discarded if their decimal equivalent is less than 32

(space), except 10 (LF) and 13 (CR):

• Data is taken as 7-bit ASCII

• The most significant data bit is ignored.

• Upper or lower case is acceptable.

3.3 Response Data Types

The data returned by the calibrator can be divided into four types:

Integer

For most computers and controllers they are decimal numbers ranging from

-32768 to 32768. For example:

*ESE 140; *ESE? returns 140

Floating

Numbers that have up to 15 significant figures and exponents. For example:

CPRT_COEFA? returns 3.908000E-03

Character Response Data (CRD)

Data returned as keywords. For example:

RTD_TYPE? returns PT385_10

Indefinite ASCII (IAD)

Any ASCII characters followed by a terminator. For example:

*IDN? returns AMETEK, ASC301, 250, 1.00

3.4 Calibrator Status

Status registers, enable registers, and queues provide status information on

the calibrator. Each status register and queue has a summary bit in the

Serial Poll Status Byte. Enable registers generate summary bits in the Serial

Poll Status Byte. The following is a list of registers and queues along with

their function.

Serial Poll Status Byte (STB)

The STB is sent when the calibrator responds to the *STB? command.

Cleared when power is reset.

Service Request Enable Register (SRE)

Enables or disables the bits of the STB. Cleared when power is reset.

Setting bits to 0 disables them in the STB. Setting the bits to 1 enables

them. Bit assignments for the SRE and the STB are shown below.

76543210

0 MSS ESB 0 EAV 000

MSS

Master Summary Status. Set to 1 when ESB or EAV are 1

(enabled). Read using the *STB? command.

ESB

Set to 1 when at least one bit in ESR is 1.

EAV

Error Available. An error has been entered into the error queue,

and may be read using the Fault? command.

Event Status Register (ESR)

A two-byte register, in which the lower bits represent conditions of the

Calibrator. Cleared when read and when power is reset.

Event Status Enable Register (ESE)

Enables and disables bits in the ESR. Setting a bit to 1 enables the

corresponding bit in the ESR, and setting it to 0 disables the corresponding

bit. Cleared at power reset. Bit assignments for the ESR and the ESE

respectively are shown below.

15 14 13 12 11 10 9 8

00000000

76543210

PON 0 CME EXE DDE QYE 0 OPC

PON

Power On. Set to 1 if power was turned on and off before the

Event Status Register was read.

CME

Command Error. Set to 1 when the calibrator receives an invalid

command. Entering an unsupported RTD type may cause such

an error.

EXE

Execution Error. Set to 1 when the calibrator runs into an error

while executing is last command. A parameter that has too

significant figures may cause such an error.

DDE

Device-dependent Error. Set to 1 when, for example, the output of

the calibrator is overloaded.

QYE

Query Error.

OPC

Operation Complete. Set to 1 when the calibrator has finished

executing all commands before the command *OPC was entered.

Error Queue

If an error occurs due to invalid input or buffer overflow, its error code is sent

to the error queue. The error code can be read from the queue with the

command FAULT?. The error queue holds 15 error codes. When it is empty,

FAULT? returns 0. The error queue is cleared when power is reset or when

the clear command *CLS is entered.

Input Buffer

Calibrator stores all received data in the input buffer. The buffer holds 250

characters. The characters are processed on a first in, first out basis.

4. Remote Commands and Error Codes

The following tables list all commands, and their descriptions, that are

accepted by the calibrator.

Table 1: Common Commands

Command Description

*CLS *CLS (Clear status.) Clears the ESR, the error queue, and the RQS bit

in the status byte. Terminates pending Operation Complete commands

*ESE Loads a byte into the Event Status Enable register.

*ESE? Returns the contents of the Event Status Enable register.

*ESR? Returns the contents of the Event Status register and clears the regis-

ter.

*IDN? Identification query. Returns the manufacturer, model number, and firm-

ware revision level of the Calibrator.

*OPC Enables setting of bit 0 (OPC for "Operation Complete") in the Event

Status Register to 1 when all pending device operations are complete.

*OPC? Returns a 1 after all pending operations are complete. This command

causes program execution to pause until all operations are complete.

*RST Resets the state of the instrument to the power-up state. This com-

mand holds off execution of subsequent commands until it is com-

plete.

*SRE Loads a byte into the Service Request Enable register.

*SRE? Returns the byte from the Service Request Enable register.

*STB? Returns the status byte.

*WAI Prevents further remote commands from being executed until all previ-

ous remote commands have been executed.

Table 2: Calibrator Commands

Command Description

CAL_START Puts the calibrator in calibration mode

CJC_STATE Turns CJC on or off.

CJC_STATE? Returns the state of the CJC

CPRT_COEFA Sets the custom RTD coefficient A

CPRT_COEFA? Returns the custom RTD coefficient A

CPRT_COEFB Sets the custom RTD coefficient B

CPRT_COEFB? Returns the custom RTD coefficient B

CPRT_COEFC Sets the custom RTD coefficient C

CPRT_COEFC? Returns the custom RTD coefficient C

CPRT_MIN_T Sets the custom RTD minimum temperature

CPRT_MIN_T? Returns the custom RTD minimum temperature

CPRT_MAX_T Sets the custom RTD maximum temperature

CPRT_MAX_T? Returns the custom RTD maximum temperature

CPRT_R0 Sets the custom RTD R0 resistance

CPRT_R0? Returns the custom RTD R0 resistance

FAULT? Returns the error code of an error that has occurred

FREQ_LEVEL Sets the frequency and pulse amplitude

FREQ_LEVEL? Returns the frequency and pulse amplitude

FREQ_TYPE Set the frequency output to continuous (frequency) or pulse.

FREQ_TYPE? Returns frequency output type, continuous or pulse

FREQ_UNIT Sets the unit for frequency and pulse

FREQ_UNIT? Returns the unit for frequency and pulse

FUNC? Returns the current mode of the upper and lower display

HART_ON Turns the HART resistor on

HART_OFF Turns the HART resistor off

HART? Returns the state of the HART resistor

LOCAL Returns user to manual operation of the calibrator

LOCKOUT Locks out the keypad of the calibrator, and allows for remote

operation only

LOOP_PWR_OFF Turns 24V loop power off.

LOOP_PWR_ON Turns 24V loop power on.

LOOP_PWR? Returns the state of 24V loop power.

LOWER_MEAS Sets the mode for measuring on the lower display.

LT_START Begin a leak test

LT_STOP Stop a leak test

LT_INITIAL? Returns the initial leak test value

LT_FINAL? Returns the final leak test value

LT_RATE? Returns the leak rate

L_PRES_UNIT Sets the pressure unit on the lower display

OUT Sets the output of the calibrator

OUT? Returns the output of the calibrator

PRES? Returns the model and serial number of the attached pressure

module

PRES_UNIT? Returns the pressure unit for the upper and lower display

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