Sutter Instrument Lambda 10-3, Operation Manual

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LAMBDA 10-3 OPERATION MANUAL – REV. 3.03 (20110829)
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5.6.1.2 Shutter or Special Commands
Shutter and Special Commands make use of the remaining command byte bit patterns not
being used by Filter Commands.
5.6.2
5.6.2 5.6.2
5.6.2 Command Transmission Protocol
Command Transmission Protocol Command Transmission Protocol
Command Transmission Protocol
The Lambda 10-3 does not use any of the standard protocols commonly used for serial line or
USB communications between computers or between a computer and a peripheral device.
The Lambda 10-3 controller, however, does generate a primitive form of protocol of which
control software running on the remote computer can, and should, make use. This protocol
consists of two main components: “confirmation command echo” and “command completion
indicator”. This command transmission protocol is used in the same manner for RS-232
serial port, USB, and parallel port connections.
5.6.2.1 Confirmation Command Echo
When the host computer sends a command to the Lambda 10-3, each byte received is
immediately echoed back to the host computer. This echoing back of each sent byte is a
confirmation that the byte has been received and will be acted upon shortly. A short period
after the last byte of a command has been echoed back, the Lambda 10-3 sends a
confirmation byte (described next) that indicates the operation associated with the command
completed.
5.6.2.2 Command Completion Indicator
When the Lambda 10-3 completes the operation associated with the command it has just
received, it transmits back to the host computer a byte value of 13 decimal (0D hexadecimal,
00001101 binary). This byte value corresponds to an ASCII carriage return (often
abbreviated as “CR”).