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680HE Synergy Indicator
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2.4.6 RS-485/422 Serial Communications
The J4 connector (
) is intended to provide a connection point for the RS-485/422 serial communications.
See
for the pin assignments for the J4 connector.
For transmit connections TXZ = TDB and TXY = TDA.
2.4.7 Digital I/O
The Digital I/O port, J5 connector (
) is intended to be connected to both digital inputs and outputs.
Digital inputs can be set to provide many functions, including most keypad functions except MENU. Digital inputs are active low
(0 VDC) and inactive high (5 VDC). Use the Digital I/O menu to configure the digital inputs.
Digital outputs are used to control relays which drive other equipment. Outputs are designed to sink, rather than source current.
Each output is an open collector circuit, capable of sinking 20 mA when active. Digital outputs are active when low or at 0 VDC,
with reference to the 5 VDC supply.
Use the Digital I/O menu to set the function of the Digital I/O pins to OUTPUT and then use the Setpoints menu to configure the
digital outputs. See
for the pin assignments for the J5 connector.
Connector
Pin
RS-485
422/485 Adapter
J4
1
GND
GND
2
RXB
TDA(-)
3
RXA
TDB(+)
4
TXZ
RDA(-)
5
TXY
RDB(+)
Table 2-7. J4 Pin Assignments (RS-485/422)
Connector
Pin
Signal
J5
1
5 VDC, 250 mA max
2
GND
3
DIO1
4
DIO2
5
DIO3
6
DIO4
Table 2-8. J5 Pin Assignments (Digital I/O)
Note
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