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Cygnus 2 Operating Manual

9.3 Message Format

The Standard message protocol serves as a structure for the contained command

or response information. It also can provide a level of acknowledgment between

the host and server and a mechanism for verifying the information content. Cygnus

2 supports the following RS-232 protocols: Standard, Dlog Comma and Dlog Page.

The Dlog protocols only provide for one-way transmission of layer data from

Cygnus 2.

Hardware handshaking is not supported.

Remote Communications parameters are set up in the General screen Comm

page.

NOTE: Communication returns "can not do now", Response Error "F", 0x46, when

Source Maintenance mode is enabled.

TCP/IP will always operate using the Standard protocol command set. It is not

affected by the RS-232 Protocol selection.

9.3.1 Protocol

Key:

<> . . . . . . Enclosed element further defined below (or above, if repeated use)

() . . . . . . . Optional Element

I . . . . . . .Or

x...x. . . . . One or more of x included

9.3.1.1 Command Packet (Host to Cygnus 2 Message)

Length . . . . . . . . . . . . . . . . . . . . . . . 2 bytes Low / High (not including checksum

or length bytes). Numeric value from 0 to

57,800 (two bytes) representing the number

of characters in the command. In order of

transmission, the low byte will precede the

high byte. For most commands, the number

for characters will be less than 256. In this

situation the low byte will contain the

character count while the high byte will have

zero value.

Message . . . . . . . . . . . . . . . . . . . . . <Command>(<Command>...<Command>)

Inficon Cygnus 2 User Manual

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