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5.2 FORM C RELAYS (standard versions)
Shown here is the schematic for a form C relay as used on the standard CIO-
RELAY08, 16, 24 and 32.
The form C relay has a COMMON, normally open (NO) and normally closed (NC)
contact. When a 0 is written to the output, the common and NC are in contact. When a
1 is written to the output the common and NO are in contact.
5.3 FORM A RELAYS (/M versions)
Shown here is the schematic for a form A relay as used on mercury wetted (/M)
models.
The form A relay has COMMON and normally open (NO) connections. When a 0 is
written to the output, the common and NO are disconnected. When a 1 is written to
the output the common and NO are in contact.
11
30
11
NORMALLY OPEN
COMMON
FORM A RELAY
3 HARDWARE INSTALLATION
3.1 Mercury whetted (/M) board special considerations
The Mercury whetted boards must be mounted in the computer such that they will
remain within 30 degrees of vertical. Note that installation of these boards in most
tower computer cases will require the tower be rested on its side for proper operation.
3.2 BASE ADDRESS
The base address switch controls the I/O location where the CPU can access the regis-
ters of the CIO-RELAY board.
The factory default is 300H (768D).
If you have a board installed at address 300H, you will have to choose a new address
from those available on your computer. You may use the list of PC I/O address
assignments found on the following page and add notes about the boards you have
installed in your computer.
Choose a new base address from those available and set the switch using the guide
below.
Please note that the switch shown below is for the CIO-RELAY08 and CIO-
RELAY16 boards. Since the CIO-RELAY32 and CIO-RELAY24 board require 4 I/O
address, their base address switch does not provide switch 2. All other settings are
identical.
If address 300H is available on your computer, we recommend that you select it. for
your board. The software examples are written for base = 300H.
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