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Figure 8-21. Setpoint expander board
mounted on component side of main
SW1
J5
NOTE:
When assigning the setpoints to
the digital out terminals,
remember that digital outputs
1 – 4 remain on the J4 terminal
of the main board, and 5 – 16
are on the J1 terminal of the
setpoint expander board.
8-22
IQ plus 800/810 Installation Manual
SETPOINT DIGITAL OUTPUT EXPANDER (OPTIONAL)
There are four standard digital outputs on the main board designed primarily
to be switch-closure outputs for controlling relays. The setpoint expander
board adds 12 additional digital output terminals, bringing the total to 16.
Like the original digital outputs, each of these is an open-collector circuit
capable of sinking 250 mA when ON and withstanding +40 VDC when
OFF. In addition, resistor pull-ups to +5 V are provided, making the outputs
capable of driving TTL or 5-V CMOS logic directly, without the need for
any additional circuitry. The logic levels are active-low. For example, a TTL
low level indicates the output is ON, and a high level indicates the output is
OFF.
The setpoint digital output expander board mounts on standoffs on the
component side of the main board (Figure 8-21). An 8-pin male terminal (J5
on the main board), plugs into a socket on the setpoint expander board as it
is being mounted on the standoffs. For reference purposes, the J5 connector
pinouts are shown in Table 8-4. With the HE or SS models, it will be
necessary to temporarily remove the main board from its mounted position
to gain enough clearance to install the setpoint expander board. The main
board can then be reattached in its original position. With the Desktop
model, the setpoint digital output expander can be mounted with the main
board in place.
board
1 -- DIGITAL OUTPUT 16
1
2 -- DIGITAL OUTPUT 15
2
3 -- DIGITAL OUTPUT 14
3
4 -- DIGITAL OUTPUT 13
4
5 -- DIGITAL OUTPUT 12
5
6 -- DIGITAL OUTPUT 11
6
7 -- GROUND
7
8 -- DIGITAL OUTPUT 10
8
9 -- DIGITAL OUTPUT 9
9
10 -- DIGITAL OUTPUT 8
10
11 -- DIGITAL OUTPUT 7
11
12 -- DIGITAL OUTPUT 6
12
13 -- DIGITAL OUTPUT 5
13
14 -- GROUND
14
Table 8-4.
Connector pinout, J5 (main board) to setpoint digital output expander board
J5-1
J5-2
J5-3
J5-4
J5-5
J5-6
J5-7
J5-8
SETPOINT
J1
OUTPUT
EXPANDER
BOARD
+5D
DOUTSTB
RESET
DOUTCLK
SDOUT
GND
HGND
HGND
SW1
MAIN CPU BOARD
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