User manual

Relay Multiplexer Command Reference 73Chapter 3
• WIRE2: Configures the E1460A as two independent 2x32
multiplexers.
• WIRE2X64: Switches the HI and LO terminals of a channel in banks 
0 through 7 to that bank’s HI COM and LO COM terminals. 
A maximum of 64 two-wire channels can be switched. This mode is
available via E1406A (Switchbox Rev. A06.00 or later). Prior to this
revision, closing control relay 0995 in two-wire mode will change the
card configuration to a single 64-channel two-wire multiplexer.
Three/Four-Wire Modes (WIRE3/WIRE4): When closing a channel in
three-wire or four-wire modes, only the lower bank (0-3) is specified.

The upper bank pair (4-7) will automatically close the specified channel.
If an attempt is made to close the upper bank pair (4-7) channels, an
error will be generated.
Closing Channels: To close:
• a single channel, use ROUT:CLOS (@ssbc) or (@ss0hbc)
• multiple channels, use ROUT:CLOS (@ssbc,ssbc,...) or
(@ss0hbc,ss0hbc,...)
• sequential channels, use ROUT:CLOS (@ssbc:ssbc) or
(@ss0hbc:ss0hbc)
• groups of sequential channels, use ROUT:CLOS (@ssbc:ssbc,
ssbc:ssbc) or (@ss0hbc:ss0hbc, ss0hbc:ss0hbc)
• or any combination of the above
NOTE Channel numbers can be in the channel_list in any random order. However,
closure order for multiple channels with a single command is

not guaranteed.
Closing the Control Relays: The control relays (0990 to 0996) can be
closed to perform special functions (for example, connecting channels to
the analog bus). Channels must be changed after the multiplexer has
been configured using the [ROUTe:]FUNCtion command. Close:
• 0990 to select the LO terminal for one-wire switching
• 0991 to connect one-wire LO REF terminal to the one-wire
LO COM terminal
• 0992 to connect lower 32 channels (banks 0 to 3) to the analog bus
• 0993 to connect upper 32 channels (banks 4 to 7) to the analog bus
• 0994 to connect lower and upper analog buses together
• 0995 to connect lower and upper common buses together (64-channel
two-wire operation)
• 0996 to connect analog bus Guard to the LO line on the upper 32
channels (banks 4 to 7)
*OPC? Command: Using the *OPC? command after the CLOSe
command in your programs will ensure that the channel CLOSe
command has executed prior to performing the next function (measure,
read, etc.). This programming practice is highly recommended.
