User manual

40 Using the Relay Multiplexer Chapter 2
To connect the HI and LO terminals of bank 0 channels 0 and 7 to the bank
0 COM terminals, execute:
FUNC 1,WIRE2
!Configures the multiplexer (card #1) for
two-wire operation
CLOS @100,107)
!Connects the HI and LO terminals of bank 0
channels 0 and 7 to bank 0 COM terminals
NOTE If the Status Register switch is set to the two-wire operating mode, the
FUNC 1,WIRE2 command is not required. The WIRE2X64 command can
be used rather than closing control relay 0995 to configure the card to a
single 64-channel multiplexer. (Available only with E1406A (Switchbox rev.
A.06.00 or later)).
Example: Switching
Channels (Three-Wire)
This example illustrates three-wire mode operation. The HI and LO
terminals of bank 0 channel 0 are closed, connecting them to the bank 0
COM terminals. The LO terminal of bank 4 channel 0 is closed, connecting
it to the bank 4 LO COM terminal. Figure 2-3 shows how the multiplexer is
configured.
For three-wire operation, the control relays are set as follows. 0990/0991 are
set open when <channel_list> is executed. 0992/0993/0996 will close when
SCAN:PORT ABUS is selected during a scan. 0992 and 0993 are opened
when not SCAN:PORT ABUS (see “Scanning Channels”). 0994/0995 are
set open when SCAN <channel_list> is executed
Figure 2-2. Example: Switching Channels (Two-Wire)
H
L
COM
L
H
CH0
BANK 0
SWITCH CARD TERMINAL MODULE
CH7
H
L
JM11JM10