Daktronics RS-422 Communication - Manual (Page 14)

RS-422 Communication Manual 8
Troub
Signal Converter
The following table gives the typical state of the signal c
either on or off. Refer to Figure 9 on next page for an
converter and the locations of the various components.
leshooting
onverter when the LEDs are
illustration of the signal
Surge Board Assembly to Controller
Surge Board TB2
(RS422 Out)
Field Cabling
Controller
TB2 (RS422 In)
Pin 1 (GND) Pin 1 (GND)
Pin 2 (RX-P) Red Pin 2 (OUT-P)
Pin 3 (RX-N) Black Pin 3 (OUT-N)
Pin 4 (TX-P) Green Pin 4 (IN-P)
Pin 5 White Pin 5 (IN-N) (TX-N)
Pin 6 Shield Pin 6 (GND) (GND)
LED
Typical States Troubleshooting
Indicators
Power
ON
Signal Converter (SC) is
receiving Power
SC is not receiving power
OFF
Internal 1 AMP fuse is bad Replace SC
TX
SC is not connected to a serial Connect to open computer
rt
On Steady
port COM po
1. Serial port or serial cable is
bad
2. Computer COM port in sleep
mode
1. Try anothe
serial ca
r port or replace
ble
2. Communicate to display
OFF Steady
Normal state, SC is not
transmitting data
Brief Flicker SC is transmitting data
RX
ON Steady
1. Field Cabling between SC
and display is bad
2. Connected to display output
jack or terminated incorrectly
3. Bad COM port on display
controller
1. Eliminate cabling by
disconnecting wire/cable
from SC to display
controller
2. Check connections and
terminations
3. Eliminate by disconnecting
wire/cable to display
controller
OFF Steady
Normal state, SC is not
receiving data
Brief Flicker SC is receiving data
TX/RX ON Steady
(If serial cable is connected)
Bad SC Replace SC