2105552MNAE | RMC-100 |
35
Figure 3-5: COMM 1 for RS-485 communication with multiple devices
3.5.5
Wire input and output
Wire the RMC I/O ports to monitor, control and power external devices. Wire for power if the external
device has no external power supply.
To wire the I/O port:
IMPORTANT NOTE:
Refer to the RMC user drawings for I/O wiring details for specific external
devices. See the
NOTICE – Equipment damage.
An external device can be powered from pin 1 (PWR) on
any of the AIs (
). The output voltage at the PWR pin
depends on the external power supply that connects to the CHARGER/EXT PWR port.
Before connecting to these pins, verify that the external device is compatible with the input
voltage at the CHARGER/EXT PWR port. Connection to an incompatible device can result in
damage to the device.
1.
Pry the terminal connector off the electric board with a slotted screwdriver.
2.
Trim the wire covering back ¼ inch (0.635 cm) on each wire.
3.
Loosen the terminal connector screws for the correct pin according to I/O tables.
4.
Insert the wires in the required pins. If powering the device from the AI or the AO:
•
Use pin 1 (PWR) and pin 3 (GND) for devices attached to the AI.
•
Use pin 1 (PWR) and pin 4 (GND) for devices attached to the AO.
•
Tighten the terminal connector screws.
NOTICE – Equipment damage.
Do not overtighten the terminal connector screws. This
can damage the wire.
5.
Insert the terminal connector into the I/O if it was removed.
3.5.5.1
Analog input pinouts
NOTICE – Equipment damage.
Before connecting to pin 1 (PWR), ensure that the
external device is compatible with the input voltage at the CHARGER/EXT PWR port.
Connection to an incompatible device can result in damage to the device.
Multivariable
transmitter
Ground -
Multivariable
transmitter
Ground -
Power +
RS-485
Tx
Rx
Power +
RS-485
Tx
Rx
