2
Example: Relay Output Operation
High Setpoint = 4 Relay ON above 4
Low Setpoint = -3 Relay ON below -3
Hysteresis = 2 Relay OFF below 2 and above -1
OFF
ON ON
Display
Val ue
OFF
-5 -4 -3 -2 -1 1 2 3 4 5
0
ON
ON
Analog Retransmission Option Board
The optional analog output board provides linear 0-10 V and 4-20 mA signals. When
the displayed value is equal to the programmed output offset value, the output volt-
age is zero and the output current is 4 mA. When the displayed value is equal to the
programmed output full scale value, the output voltage is 10 V and the output current
is 20 mA.
When the displayed value is between the output offset and output full scale value:
1. The output voltage = 10 X
(displayed value - output offset)
(output full scale - output offset)
V,
2. The output current = 16 X
(displayed value - output offset)
(output full scale - output offset)
mA + 4 mA
RS 485 Serial Communications Option Board
The optional serial communication board allows a host device to download and read
programming parameters and to read status information from the DPM, such as
display value, relay status, etc.
This manual does not contain information on the serial communication protocol or
the serial command list. That information is contained in the 57700 serial specifica-
tion and is obtainable by contacting the Durant Literature Department at 800-540-
9242 (U.S. and Canada), or 920-261-4070, or by FAX at 920-261-9097.
DESCRIPTION cont.
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