User manual

Using the Relay Multiplexer 37Chapter 2
Switching Channels
For general purpose switching, you can switch channels (connect or
disconnect signals) in one-wire, two-wire, three-wire, or four-wire operating
modes by opening or closing specific channel(s).
NOTE For more information, see the [ROUTe:]FUNCtion command. There is no
need to send the [ROUTe:]FUNCtion command if the status register switch
(see "Setting the Status Register Switch") is set to the correct operating
mode.
Switching Channels
Comments
Setting Multiplexer Function. Use FUNCtion <card_number>,<function> to
configure the Relay Multiplexer, where <function> = WIRE1 | WIRE2 |
WIRE2X64 | WIRE3 | WIRE4.
Opening/Closing Channels. Use CLOSe <channel_list> to close bank
channel(s) and OPEN <channel_list> to open bank channel(s). Channel_list
has the form (@ss0hbc) where ss = card number (00-99), 0h = one-wire
mode only HI/LO switching (00 or 01), b = bank number (0-7), and c =
channel number (0-7).
Opening/Closing Multiple Channels. To close or open multiple channels,
place a comma (,) between the channel numbers. To close or open a range
of channels, place a colon (:) between the channel numbers. You can do this
for both single or multiple module switchboxes. See [ROUTe:]OPEN and
[ROUTe:]CLOSe for additional information.
Querying Open/Closed Channels. The CLOS? <channel_list> and OPEN?
<channel_list> commands determine if the channel in the channel_list is
open or closed, respectively. (The query command does not determine if, in
the event of a hardware failure, the channel remains open/closed.) See
[ROUTe:]OPEN? and [ROUTe:]CLOSe? for additional information.
Switching Control Relays. The control relays 0990 to 0996 can also be
switched using the OPEN and CLOSe commands, provided the FUNCtion
command is executed first. See [ROUTe:]OPEN and [ROUTe:]CLOSe for
additional information.
FRES: When operating in one-wire mode, 4-wire resistance measurement
(FRES) is not supported. See the [ROUTe:]SCAN:MODE command for
additional information.
Analog Bus Connection When Scanning. In all four modes of operation, the
analog bus can be connected during a scan using the SCAN:PORT
command. In three-wire mode, the paired bank (4-7) channel LO terminal
can be connected to the analog bus Guard terminal. See the
[ROUTe:]SCAN:PORT command for additional information.