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.
3 0 N O R M A L LY O P E N
11C O M M O N
FO R M A R EL AY
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.
3HARDWARE INSTALLATION
3.1Mercury 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
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
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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