SYSTem:MODule:ROW:PROTection

34980A

SYSTem:MODule:ROW:PROTection

Syntax

SYSTem:MODule:ROW:PROTection <slot>, <mode>
S
YSTem:MODule:ROW:PROTection? <slot>

or

SYSTem:MODule:ROW:PROTection  DEFault, <mode>

S
YSTem:MODule:ROW:PROTection? DEFault

Description

These commands set the slot row protection mode and default row protection mode for the 34934A. The row protection circuitry protects the reed relays from in-rush currents.

Used With:

  • 34934A High-Density Matrix Module

Parameters

Name

Type

Range of Values

Default Value

<slot>




 or

 

DEFault

Discrete

{1|2|3|4|5|6|7|8}

selected mode applies to all 34934A rows in the specified slot. The mode is set upon execution of the command.

 

selected mode is the default mode set following power-on, *RST, SYSTem:PRESet, or SYSTem:CPON.
 

none



 

 

none

<mode>

Discrete

FIXed - closes the row protection relays which places 100Ω protection resistors in the signal paths of all rows.

ISOlated
- opens the row protection relays and bypass relays of all rows. This isolates the 32-column banks from all other banks. This mode is valid for the 4x32, 8x32, and 16x32 configurations only.

AUTO100 - closing any channel in a given 32-column bank closes the corresponding row protection relay which places a 100Ω protection resistor in the signal path. The row protection relay remains closed as long as any channel in the same 32-column bank connected to that row is closed.

AUTO0 - closing any channel in a given 32-column bank closes the row protection relay, momentarily placing a 100Ω protection resistor in the signal path. The bypass relay is then closed and the protection relay is opened (see "Remarks" for more information on AUTO0 mode).

AUTO100

Remarks

  • A row protection relay (resistor) and bypass relay are located on each row accessed by each 32-column bank within the different matrix configurations (4x32, 4x64, 4x128, 8x32, 8x64, 16x32). Depending on the row protection mode, there may be a maximum of 200Ω of resistance for a 1-wire connection between any two column banks.  

  • The fastest switching speeds for relays in a given signal path are achieved using the FIXed or ISOlated modes, followed by the AUTO100 and AUTO0 modes. When using the AUTO100 or AUTO0 mode, specifying more than one channel rather than a single channel in the channel list will improve cumulative switching speed.

  • In AUTO0 mode, the row protection relays are operated based on the channel list specified in the ROUTe:CLOSe or ROUTe:CLOSe:PAIR command. Upon receiving the command, the relay sequence is as follows:

    1.  row protection relay(s) for the corresponding 32-bank(s) is/are closed
    2.  column (crosspoint)  relay(s) is/are closed
    3.  bypass relay(s) is/are closed
    4. row protection relay(s) is/are opened

    For multiple channels in the channel list, steps 1, 3, and 4 are performed for each channel simultaneously - thus increasing cumulative switching speed.  

  • Recalling (*RCL) the matrix module configuration from a saved (*SAV) state will restore the row protection mode set for that slot at the time the state was saved.  

  • Power-on, *RST, SYSTem:PRESet, or SYSTem:CPON restores the row protection mode last specified as the DEFault mode. Following any of these actions, if the default mode is ISOlated an error occurs on 34934A modules not configured as a 4x32, 8x32, or 16x32 in the 34980A mainframe.  

Return Format

The query form of these commands return the current discrete mode settings.

Examples

This example sets the row protection mode to FIXed which closes the row protection relays of all rows in slot 1. Note that the row relays are closed upon execution of this command.

SYST:MOD:ROW:PROT 1, FIX

This example sets the row protection mode to AUTO0 for all rows in slot 1.

SYST:MOD:ROW:PROT 1, AUTO0

This example sets the default row protection mode to ISOlated. This mode is restored for all rows on all 34934A matrix modules in the 34980A at power-on or following *RST, SYSTem:PRESet, or SYSTem:CPON.

SYST:MOD:ROW:PROT DEF, ISO

These examples query the current row protection mode for the module in slot 1 and the default mode for all 34934A modules in the 34980A mainframe.

SYST:MOD:ROW:PROT? 1

Typical Response: AUTO0

SYST:MOD:ROW:PROT? DEF

Typical Response:  ISO

See Also

ROUTe:CLOSe

ROUTe:CLOSe:PAIR