PlantLinc
PLR5000 User’s Guide
P/N 161-09888-001
DATA-LINC
Group
4
4. If your system is configured to use a Repeater(s), find the PLR5000(s) marked “REPEATER,” and
connect its power supply as with the Master above. The red LED marked “P” (power) on the radio
modem should turn on. If your system does not have a Repeater, skip this step.
5. Locate the PLR5000(s) labeled “REMOTE.” Connect the power supply to the PLR5000. The red LED
marked “P” (power) on the “REMOTE” radio modem should turn on. If it is a point-to-point system the
amber LED “C” (carrier detect) should turn on for both the Remote and Master. If it is a point-to-
multipoint system the “C” LED will turn on for the Remote only. Attach a Loop Back Test Jumper on the
RS232 data DB9F connector of the PLR5000 remote. The jumper shorts pins 2 and 3 of the data
connector.
6. Using the terminal that is connected to the “MASTER” PLR5000, hold down a key, “A” for example.
The letter “A” should begin to scroll across the terminal screen. This indicates that the data (the letter “A”
in this case) is being transmitted from the terminal through the “MASTER” PLR5000. Then through the
“REPEATER” (if applicable), on to the “REMOTE” PLR5000, through the Loop Back Test Jumper, back
through the “REPEATER” (if applicable) to the “MASTER,” and then the terminal. This establishes that
the PLR5000s are functioning in full duplex mode and are operating properly. Note: If something appears
scrolling across the terminal screen other than the correct character for the key being pressed, it indicates
that the terminal’s settings and data rate may not be set to match that of the PLR5000.
7. While continuing to press the letter “A,” the yellow LED marked “I” (Input) and the green LED marked
“O” (Output) should both be flashing rapidly on the Master radio modem and the Remote with the jumper
attached. Remove the jumper from the “REMOTE” radio modem. The letter display scrolling across the
screen should stop, and the “O” LED will stop flashing at the “MASTER.” The “I” LED will flash each
time the key is pressed; indicating that the radio modem is receiving a data input signal on the RS232
port. The “O” LED on the “REMOTE” will flash each time a key is pressed; indicating that the radio
modem is outputting a data input signal on the RS232 port. The “I” LED on the “REMOTE” will remain
off with no data Loop Back . Replace the Loop Back Test Jumper in the “REMOTE” radio modem. Hold
down the key again, and the letter should once again scroll across the computer screen. If there is a
“REPEATER” in the system its “C” (carrier detect) LED will flash rapidly when data is being passed.
The “REPEATER” “I” and “O” LED’s remain off during normal operation.
Repeat steps 5 through 7 with each of the “REMOTE” units for your system.
Data-Linc Group strongly recommends that once these tests have been successfully completed, all devices
that will be used in the system (PLC, RTU, software, computers, etc.) be connected to the system and bench
tested to assure full functionality before final installation. If the radios will not function in the system on the
bench, remove the radio modems from the system and confirm that the equipment will communicate with a
direct hard wire link. If the devices will not communicate directly without the radio modems, then they will
not communicate with them. The radio modems emulate a direct asynchronous communication link.
Once the preceding bench tests have established that the system is fully functional, site installation should
proceed. However, before connecting the entire system hardware, Data-Linc Group recommends that steps 3
through 7 above be performed on-site to confirm radio modem operation and adequate line of sight between
the antennas.
