1-2
1
each line can source up to 24 mA or sink up to 48 mA. The boards can also
monitor 15 of the digital lines and interrupt the system controller when a
change occurs.
The units also provide six relay driver outputs that can be used to actuate
external solenoids, drive relays or operate any device requiring a high sink
current.
All units use SCPI and/or short form commands to set their configuration
parameters, transfer data, operate the control lines, take measurements and
to set its address. All settings are retained in nonvolatile Flash memory and
are recalled at power turn-on or when the unit is reset. This means that the
unit has to only be configured once until used in another application. The
SCPI and short form commands can also be used to query the current
parameter settings and all input signals. SCPI stands for Standard Commands
for Programmable Instruments. Refer to the appendix for additional
information about SCPI commands.
At power turn-on, the units perform a self test of their internal logic. At the
end of the self test, the units displays their address by momentarily blinking
the address on its LEDs before displaying the normal Power-on - Ready
condition.
1.2.2
Board Units
The Model 4807 and 2307 DAQ and Control Boards are small 4.5 x 5.5 inch
PCB assemblies that are powered from 5 Vdc. The analog and digital signals
are on a right-angle metal shell connector with lock studs for secure signal
connections in any application. The Model 4807 has an GPIB/IEEE-488.2
compatible interface and a header for connection to an ICS GPIB Connector/
Address Switch Assembly. The Model 2307 has RS-232/RS-422/RS-485
compatible serial interfaces on a right-angle 9-pin DE connector for direct
connection to a serial link. Both boards are designed to be installed
internally in a piece of equipment and to be shielded by the host equipment's
case.
The 2307 may be controlled over an RS-232 or RS-422/RS-485 point-to-
point data link in which case it does not need or use an address. The 2307
can also operate on a multidrop RS-422 or RS-485 network, when address
mode is enabled. In this case the 2307 can be enabled to recognize an
