268XA
Service Manual
6-12
An input line to the device consists of one or more semicolon-separated commands
followed by an input terminator. The device will accept CR/LF or LF as the input
terminator. The device reads input into a 350-byte input queue until it finds the input
terminator. The device does not echo input. While processing the queued input, the
device parses and processes each command in sequence. Therefore, earlier commands
can execute even if a later command contains a syntax error.
The prompts have the following meanings:
=> No error. Command was parsed and executed with no errors.
?> Command error. The command contained a syntax error. For example, the command
name or an argument contained a type; the command was not a legal command; an
argument was of the wrong type; too many or too few arguments were supplied. Since
parity is always set to none, parity errors cause garbage in the input buffer, and this will
generate a syntax error (at best).
!> Execution or device-dependent error. An execution error occurs when the command
was recognized to be an device command but was not legal given the current state of the
device, or had an inappropriate parameter value. A device-dependent error occurs when
an device-specific limitation is exceeded (such as input queue size), or when the device
tries to execute the command but it fails (for example, due to a bad CRC).
If a command cannot be recognized (i.e., syntax error), the device returns the ?> error
prompt and does not do any more processing on that command or the remaining contents
of the input queue. If a query had already been processed on that line, its response would
be sent before the prompt.
If the input queue size is exceeded, the device throws away all further input until it
receives a terminator, and generates a device-dependent error. None of the commands in
the queue are executed. The device returns the !> prompt when it encounters the input
terminator.
If the device receives an input line before its last prompt has been read out of its output
queue, the device will generate an execution error, return the !> error prompt instead of
whatever prompt it had planned to return, and ignore the second input line.
If an input line contains more than one query command, the responses will be returned in
one response line separated by semicolons.
When sending a response or prompt, the device appends an output terminator which is
the CR/LF character. The device output can be held off with XON/XOFF.
The string formats and general syntax rules are the same as Hydra’s.
The following settings are fixed: eight data bits, no parity, no echo, XON/XOFF flow
control, and no CTS flow control. The user can set the baud rate to 4800, 9600, 19200, or
38400.
Device Configuration
The FUNC command is used to select a measurement function, range, and number of
terminals on channel one only. When executing the *RST or *TST? command, or when
exiting calibration mode, the device sets the configuration to the values shown below in
Table 6-6:
Summary of Contents for 2680A
Page 6: ......
Page 12: ...268XA Service Manual vi ...
Page 18: ...268XA Service Manual 1 2 ...
Page 48: ...268XA Service Manual 1 32 ...
Page 96: ...268XA Service Manual 2 48 ...
Page 98: ...268XA Service Manual 3 2 ...
Page 106: ...268XA Service Manual 3 10 ...
Page 132: ...268XA Service Manual 5 2 ...
Page 194: ...268XA Service Manual 6 48 ...
Page 196: ...268XA Service Manual 7 2 ...
Page 204: ...268XA Service Manual 7 10 268X FINAL ASSEMBLY alg105f eps Figure 7 1 268XA Final Assembly ...
Page 207: ...Replaceable Parts Parts Lists 7 7 13 2680A DIO alg100f eps Figure 7 3 DIO Module ...
Page 209: ...Replaceable Parts Parts Lists 7 7 15 2680A FAI alg102f eps Figure 7 4 FAI Module ...
Page 211: ...Replaceable Parts Parts Lists 7 7 17 2680A PAI alg103f eps Figure 7 5 PAI Module ...
Page 214: ...268XA Service Manual 8 2 ...
Page 215: ...8 3 8 Schematic Diagrams Figure 8 1 Backplane PCA 2680A 4001 ...
Page 216: ...268XA Service Manual 8 4 Figure 8 1 Backplane PCA cont 2680A 1001 ...
Page 217: ...8 5 8 Schematic Diagrams Figure 8 2 Controller System Power PCA 2680A 4004 ...
Page 223: ...8 11 8 Schematic Diagrams Figure 8 3 Digital I O PCA 2680A 4006 ...
Page 224: ...268XA Service Manual 8 12 Figure 8 3 Digital I O PCA cont 2680A 1006 1 of 3 ...
Page 225: ...8 13 8 Schematic Diagrams Figure 8 3 Digital I O PCA cont 2680A 1006 2 of 3 ...
Page 226: ...268XA Service Manual 8 14 Figure 8 3 Digital I O PCA cont 2680A 1006 3 of 3 ...
Page 227: ...8 15 8 Schematic Diagrams Figure 8 4 Backplane Extender PCA 2680A 4009 ...
Page 228: ...268XA Service Manual 8 16 Figure 8 4 Backplane Extender PCA cont 2680A 1009 ...
Page 229: ...8 17 8 Schematic Diagrams Figure 8 5 Extender PCA 2680A 4010 ...
Page 230: ...268XA Service Manual 8 18 Figure 8 5 Extender PCA cont 2680A 3010 ...
Page 231: ...8 19 8 Schematic Diagrams Figure 8 6 A D Supply Assembly 2680A 4031 ...
Page 232: ...268XA Service Manual 8 20 Figure 8 6 A D Supply Assembly cont 2680 1031 ...
Page 233: ...8 21 8 Schematic Diagrams Figure 8 7 PCMCIA PCA 2680A 4041 ...
Page 234: ...268XA Service Manual 8 22 Figure 8 7 PCMCIA PCA cont 2686 1041 ...
Page 235: ...8 23 8 Schematic Diagrams Figure 8 8 Output PCA 2680A 4062 ...
Page 236: ...268XA Service Manual 8 24 Figure 8 8 Output PCA cont 2680A 1062 ...
Page 237: ...8 25 8 Schematic Diagrams Figure 8 9 A D PFE PCA 2640A 4003 ...
Page 238: ...268XA Service Manual 8 26 Figure 8 9 A D PFE PCA cont 1 of 6 ...
Page 239: ...8 27 8 Schematic Diagrams Figure 8 9 A D PFE PCA cont 2 of 6 ...
Page 240: ...268XA Service Manual 8 28 Figure 8 9 A D PFE PCA cont 2640A 1003 3 of 6 ...
Page 241: ...8 29 8 Schematic Diagrams Figure 8 9 A D PFE PCA cont 2640A 1003 4 of 6 ...
Page 242: ...268XA Service Manual 8 30 Figure 8 9 A D PFE PCA cont 2640A 1003 5 of 6 ...
Page 243: ...8 31 8 Schematic Diagrams Figure 8 9 A D PFE PCA cont 2640A 1003 6 of 6 ...
Page 244: ...268XA Service Manual 8 32 Figure 8 10 A D FFE PCA 2645A 4003 ...
Page 245: ...8 33 8 Schematic Diagrams Figure 8 10 A D FFE PCA cont 2645A 1003 1 of 6 ...
Page 246: ...268XA Service Manual 8 34 Figure 8 10 A D FFE PCA cont 2645A 1003 2 of 6 ...
Page 247: ...8 35 8 Schematic Diagrams Figure 8 10 A D FFE PCA cont 2645A 1003 3 of 6 ...
Page 248: ...268XA Service Manual 8 36 Figure 8 10 A D FFE PCA cont 2645A 1003 4 of 6 ...
Page 249: ...8 37 8 Schematic Diagrams Figure 8 10 A D FFE PCA cont 2645A 1003 5 of 6 ...
Page 250: ...268XA Service Manual 8 38 Figure 8 10 A D FFE PCA cont 700p29_topress zip 2645A 1003 6 of 6 ...
Page 251: ...8 39 8 Schematic Diagrams Figure 8 11 Analog Input Connector PCA 2620A 4004A ...
Page 252: ...268XA Service Manual 8 40 2620A 1004 Figure 8 11 Analog Input Connector PCA cont ...
Page 253: ...8 41 8 Schematic Diagrams Figure 8 12 Display PCA 1 of 1 ...
Page 254: ...268XA Service Manual 8 42 Figure 8 12 Display PCA cont 1 of 1 ...