RFL Electronics GARD 8000 - Figure 11-5. Manual Loopback

Tests and Diagnostics
GARD 8000 SYS RFL Electronics
February 14, 2011 11-14 973.334.3100
Manual Loop-Back:
The manual lop-back requires an external loop-back connector attached to the 37-pin interface
connector. The loop-back connector acts as a crossover for the transmit data and receive data. The
GARD 8000 must be disconnected from the remote terminal. See Figure 11-5.
Figure 11-5. Manual Loopback
If the digital interface module is internally timed:
 Connecting the loop-back connector will loop the chassis back on itself.
 The manual loop-back button does not need to be activated.
 Set the devices, TPS channels or Functional modules, TX and RX addresses to the same
value.
If the Digital interface is in Loop timing:
 Remove the cable from the DB-37 connector.
 Select click on the “Manual Local” button to enable.
 Click on “Execute”.
 Attach the loop back connector.
 Set the devices, TPS channels or Functional modules, TX and RX addresses to the same
value.
An external loop-back plug can be made using a female DB-37 connector and jumper:
Pins 4 to 6
Pins 22 to 24
GARD 8000
Rx Data
TX
Data
TX
Data
RX
Data
Digital interface
Remote
Terminal