Serial Communication for TKE Legacy Control Systems LD-16 Door Operator - Modernization
72 © Vertical Express
Serial Interface Board LED Definitions
Serial Interface Board Troubleshooting Guide
LED Color Use Status Definition
PWR Green 24VDC Power Input ON
• +24VDC correct at CON3.
• F1 fuse is functional.
• All low voltage power supplies are functional.
TXA Green CAN Packet Transmit Blinking CAN comm. transmitted from CON1 to CAN Interface Board.
RXA Green CAN Packet Receipt Blinking CAN comm. received at CON1 from CAN Interface Board.
ERRA Red CAN Packet Errors
Blinking
or ON
Serial Interface Board detecting CAN packet errors.
TXD2 Green RS485 Packet Transmit Blinking RS485 comm. transmit from CON11 to TKE control system CPU.
RXD2 Green RS485 Packet Receipt Blinking RS485 comm. received at CON11 from TKE control system CPU.
ERR2 Red RS485 Packet Errors
Blinking
or ON
Serial Interface Board detecting RS485 packet errors.
Problem Possible Causes or Solutions
RX_ or TX_ LEDs are not blinking.
1. Press RST on the Serial Interface Board, and all LEDs illuminate for 1
second - LEDs are good and the microprocessor board is functional.
If not, verify the following:
a. +24VDC power input problems.
b. F1 Fuse (1/2 amp Pico).
c. Board replacement.
The RX_LEDs will not blink if communication is not established, or if wiring
is not correct. The TX_LEDs may blink at first, even with faulty wiring, as
the board attempts to establish communication.
Serial Interface Board stops trying to communi-
cate on one of the channels (CAN or RS485)
because the other channel cannot be established.
• If the CAN bus to the door operator does not function for 10 sec-
onds or longer, the board will stop trying to communicate to the
TKE CPU on the RS485 channel to signal to the TKE CPU that
door communications are offline, and the TXD2 LED will stop
blinking.
• If the RS485 bus to TKE CPU does not function for 10 seconds or
longer, the board will stop trying to communicate to the LD-16
door board on the CAN channel to signal to the LD-16 door board
that door communication to the controller CPU is offline, and the
TXA LED will stop blinking.
Verify the following:
• LEDs per the Serial Interface Board - LED Definitions (see above).
• Both TX_LEDs are blinking.
• No ERR_LEDs are blinking or ON.
TIP: Use the IMS Smart FAST to query the LD-16 door board for the RS485
and CAN channels. If the IMS Smart FAST fills in the adjustment menu with
values, communication is established. The IMS Door I/O & Faults Screen (in
Door Diagnostics) will show ONLINE status = ON.
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