Alicat EPC Series Bedieningshandleiding - Pagina 7

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RS-232 / RS-485 OUTPUT AND INPUT

EPC and EPCD pressure instruments come standard with integrated multi-drop

RS-232 or RS-485 as ordered.

Flow Vision Software

Flow Vision is an affordable software program that interfaces with RS-232 or

RS-485 and is compatible with most of the aforementioned flow and pressure

instruments.

The graphical user interface (GUI) provides automatic configuration, session saving

for easy configuration and experiment setup reloads, data capturing and logging

(including a graphing tool), simple script building for automating meter and control

command sequences, software alarms and support for multiple devices.

Flow Vision SC™ is for general use with up to 26 different devices, while Flow

Vision MX™ is specifically designed for gas mixing applications.

Additional Compatible Programs:

Many serial communication type software packages including PuTTy and LabVIEW

are also compatible with these instruments. To set up serial communication it is

important to note which COM port the device is connected to and the baud rate on

the device (default 19200).

It may also be useful to make sure the program will move to the next line when

pressing "Enter" or "Return". The number of data bits should be set to 8, and the

number of stop bits should be set to 1. Parity and flow control should be disabled.

Not all programs have these options and care should be taken to determine the

proper communication setup with the desired program.

Sending a Command

In this section, a command will be denoted with a different font. For example,

command<CR> . <CR> will be used to symbolize a carriage return. How a

carriage return is entered is dependent on the serial communication program

being used.

With Serial Terminal, this can commonly be accomplished by pressing "Enter"

or "Return". Parenthesis denote a value that must be filled in by the user.

For example,(unit ID)<CR> should be changed to A<CR> when using a

device with Unit ID "A". It may also be useful to note that commands are case

insensitive. For example, A<CR> is equivalent to a<CR>.

Polling Mode

All Alicat devices are sent in Polling Mode with Unit ID A unless otherwise

requested. Polling a device will return a data frame of the current

measurements in the device in units shown on the display. See Data Format,

later in this section, for more information. Each unit may be polled individually

using the command (unit ID)<CR>.

A device's Unit ID may be changed using the command (current unit

ID)@=(desired unit ID)<CR>. The Unit ID can also be changed via the

front panel using the RS-232 / RS-485 communication select menu.

Care should be taken not to assign the same unit ID to more than one device on

a single COM port. Up to 26 units may be connected simultaneously as Unit IDs

between A and Z are allowed.