Functions Reference
43
Gx6384Open
Purpose
Opens a relay specified by group, row, and column.
Syntax
Gx6384Open
(
nHandle, nGroup, nRow, dwColumn, pnStatus
)
Parameters
Name
Type
Comments
nHandle
SHORT
Handle to a GX6384 board.
nGroup
SHORT
If the Switch Matrix is configured as two groups with 32 columns (default configuration)
Group numbers are:
0.
GX6384_GROUP_A
1.
GX6384_GROUP_B
If the Switch Matrix is configured as one group with 64 columns the only Group is:
0.
GX6384_GROUP_A
nRow
SHORT
Row numbers are:
0.
GX6384_ROW_0: row number 0 (all models).
1.
GX6384_ROW_1: row number 1 (all models).
2.
GX6384_ROW_2: row number 2 (models GX6384-2 and GX6384-3 only).
3.
GX6384_ROW_3: row number 3 (models GX6384-2 and GX6384-3 only).
4.
GX6384_ROW_4: row number 4 (GX6384-3 only).
5.
GX6384_ROW_5: row number 5 (GX6384-3 only).
nColumn
SHORT
Specified column relay number is as follows:
0-31: Switch Matrix is configured as two groups with 32 columns (default configuration).
0-63: Switch Matrix is configured as single group with 64 columns.
pnStatus
PSHORT
Returned status: 0 on success, negative number on failure.
Comments
The Switch Matrix can be configured via software as two groups with 32 columns or one group with 64 columns.
The function opens the specified relay at the specified group’s row column. The function ensures that a proper delay
is used from the last open command. This prevents relay being closed before a previous switching command is
complete.
Caution -
The flexibility provided by the switch matrix means that any point could be connected to any
other point. Extreme care should be observed when developing the control software to prevent shorts between low-
impedance sources (such as power supplies). A typical method to prevent such shorts is to use a resistor in series
between the power supplies and the switch matrix if these signals are for measurement purposes only. Before closing
a relay, verify that no other low-impedance source is connected to the same Row/Column.
Summary of Contents for GX6384-1
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