I
NSTRUTECH
C
ORPORATION
ITC-18/PCI
U
SER
’
S
M
ANUAL
3
CURRENT DRIVER OUT
:
DB-25 female connector. The
ITC-18
provides 14 digital output channels that
can be used either as standard TTL levels or as current sink. To use as current
sink channels the connections to the external device is as follow:
HOST COMPUTER
FUSE
SERIAL I/O
DIGITAL I/O and SEQUENCER OUTPUTS
FUSE
CURRENT DRIVER OUT
EXT CLK
100 - 240 VOLTS
+
-
Digital Output
Note: The current sink grounds are fuse protected in case
current is fed back to the ITC-18 interface. A low-impedance
connection should be made if a common-ground external power
Ground
Relay
Valve
etc
Power
Supply
supply is used. As shown maximum drive current is 350 mA.
VR-10/VR-100
IN
Maximum power supply voltage 50 Volts
ClampA
Figure 4: ITC-18 Current Driver Out external connections
4
FUSE
:
Current driver out ground fuse. This fuse will open when current is fed back
into the
ITC-18
. Replace fuse with a standard 1.5 inch type F 1/8A fuse only.
5
DIGITAL I/O & SEQUENCE OUTPUTS
:
Dual 50 pin IDC connector. 16 Digital input lines with individual grounds, 16
Digital output lines with individual grounds (Channel 1) and 7 sequencer
outputs with individual grounds.
6
EXT CLK: (optional)
BNC connector. The external clock option allows multiple ITC-18 interfaces to
be synchronized by an external master clock. Please contact Instrutech or your
dealer for availability and specifications. If this option is installed, the absolute
maximum voltage range for this input is
±
4 volts peak.
Do not exceed this
range or damage can result to the input circuitry.
7
HOST COMPUTER:
80 pin high density connector. Connection to host interface board. For
Macintosh use either a MAC-18 (NUBUS bus host) or PCI-18 (PCI bus host)
interface. For Intel based computers use either a AT-16 (ISA bus host) or PCI-
18 (PCI bus host) interface. Note: the inter connecting cable is supplied with
the host interface card.
16
