CIA-675-001 Rev 1.1
8 |
P a g e
Direct: (602) 773-1700
Main: (800) 481-7459
2101 W Peoria Ave, Suite 100
Phoenix, AZ 85029
www.opentechalliance.com
Incoming PWR:
Incoming power (15-24VDC) is connected to the connector at the bottom left-hand
corner of the board. Figure 4 “To Power Supply”. A 24V 5A DC supply is provided by default. One
suggested P/N is SDI120-24-U-P51 by CUI. This is sufficient for systems having up to 6 keypads. If more
devices are required a larger DC supply would be required. The DC supply is to be mounted separately
outside the enclosure.
RS485/ Outgoing PWR
: RS485 data communication originate here in 2 connectors (2 parallel channels).
Each will support 16 devices such as keypads and relay modules. We recommend that power and RS485
data communications be via a single 18 AWG, 4-conductor shielded cable. The shield drain wire can be
used as the EARTH common wire. Do not connect more than one RS485 cables to each channel. For each
channel all attached devices shall be connected as an inline chain beginning with the Gateway and ending
with the last device. The last device shall have a “termination” jumper installed as shown in the Keypad and
Relay module manuals. All other devices shall have this jumper omitted.
These RS485 connectors have 6 pins.
DC + V (15-24VDC)
Required
Red
DC – V (DC Common)
Required
Black
Earth
Optional
PCB has earth ground connector on bottom left mounting screw
RS485-A
Required
RS-CMN
Recommended
Can use cable shield
RS-485-B
Required
RS485 Limitations:
A wired keypad can be located up to 4000 feet from the Gateway given proper twisted pair
cable with ground wire is used.
To properly terminate cables into connectors the following instructions apply.
1.
Strip back the outer insulation and shield foil from both of the 18 AWG, 4-conductor, shielded cables
being careful not to cut the bare shield wire. Strip ¼ inch of insulation off the end of each of the
individual-colored conductor wires.
2.
Remove the terminal blocks from the keypad circuit board by sliding them up and off. The terminal
blocks may be somewhat difficult to remove as a tight electrical connection is necessary. If they are
tight, rock them slightly back and forth while lifting away from the board.
3.
Insert wires into the desired connector. Where 2 wires are tied together ensure that both wires are
seated all the way inside the slot. Use a flathead precision screwdriver to tighten down the terminal
screw.
4.
Verify that the terminal slot has tightened down on the copper wire and not on the rubber
insulation. There should be no copper wire showing outside of the terminal slot. Gently tug the wires
to verify that they are tightly held inside the terminal slot. Repeat this process with each of the
remaining wire connections.
