Quantum-composers Motorized Attenuator Instrukcja Użytkownika Pobierz pdf (Strona 5)

6 Command Set

The motorized attenuator communicates via a standard RS232 connection. The default

communication settings are 57,600 baud, 8 data bits, even parity and 1 stop bit (57600,

8, E, 1). A typical serial port pin out is shown below. Only the Rx, Tx and Gnd are used

to communicate with the aperture. The included software can be used to operate the

unit over the serial port at the default baud rate of 57,600.

Typical PC Serial Port (DB9)

Pin No.

Name

Description

DCD

Data Carrier Detect †

RS232 Receive

RS232 Transmit

DTR

Data Terminal Ready †

Gnd

Ground

DSR

Data Set Ready †

RTS

Request to Send †

CTS

Clear to Send †

Ring Indicator †

† denotes signal not used by the module

Device Command Format

All commands use ASCII characters and are composed of the following fields:

<Prefix><Address><Deliminator><Command String>[Parameters]<Terminator>

Field

Description

Prefix

Single semicolon character ";", must precede all commands. All

devices will reset their command input buffer when the prefix is

received.

Address

2 ASCII characters. Each device has a unique address which is

programmed into its firmware. See the table below for a list of

addresses.

Deliminator

Single colon character “:”, must follow device address.

Command

String

Commands are specific to each device -- see the following

sections for the commands that each device supports.

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