Rice Lake 920i USB Installation Manual V5.05 - Manual (Page 18)

12 920i Installation Manual
2.3.5 USB Communications (Port 2)
The USB interface provides type-A and type-B
connectors.
Compatible devices using a type-A connector include a
flash drive, keyboard, USB hub, and label and ticket
printers. The host PC uses a type-B connector.
Type-A Connector Type-B Connector
Figure 2-6. USB Interface Board Connections
2.3.6 Digital I/O
Digital inputs can be set to provide many indicator
functions, including all keypad functions. Digital
inputs are active low (0 VDC), inactive high (5 VDC).
Digital outputs are typically used to control relays that
drive other equipment. Outputs are designed to sink,
rather than source, switching current. Each output is a
normally open collector circuit, capable of sinking 24
mA when active. Digital outputs are wired to switch
relays when the digital output is active (low, 0 VDC)
with reference to a 5 VDC supply.
Table 2-5. J2 Pin Assignments (Digital I/O)
J2 Pin J2 Signal
1 +5 VDC
2 GND
3 DIO 1
4 DIO 2
5 DIO 3
6 DIO 4
7 DIO 5
8 DIO 6
Digital inputs and outputs are configured using the
DIG I/O menu. See Section 3.2.6 on page 52 for
configuration information.
An optional 24-channel digital I/O expansion card, PN
67601, is available for applications requiring more
digital I/O channels.
Note
Digital I/O points can be configured to count
active pulse inputs by setting them to PROGIN
(DIGIN menu) and using the iRite
DigInSsBbActivate handler. However, the fastest pulse rate
that can be counted using a digital input is 10Hz (10 pulses
per second). More demanding applications can use the
pulse input option card (PN 67603) to count pulses in the
4–4000Hz range.