SYSTem:MODule:ROW:PROTection
Syntax
SYSTem:MODule:ROW:PROTection <slot>,
<mode>
SYSTem:MODule:ROW:PROTection? <slot>
or
SYSTem:MODule:ROW:PROTection DEFault,
<mode>
SYSTem: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>
DEFault |
Discrete |
{1|2|3|4|5|6|7|8} 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. 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