FRICK
®
QUANTUM™ COMPRESSOR CONTROL PANEL S90-010 CS (APR 08)
COMMUNICATIONS SETUP Page 7
COMMUNICATIONS LOOPBACK TEST
With version 5.0x Quantum™ software, a method of
testing the onboard RS-422 and RS-485 communications
ports was developed. By utilizing a loopback test harness
(as shown below), the maintenance technician now has
the ability to locally test the Quantum™ communications
hardware and jumper configuration.
Hardware Setup for RS-422 Testing
To create the test harness for RS-422 communications
loopback testing, use the following example:
Set the Quantum™ 4 communications jumpers as follows:
•
Set LK11 to position
B
•
Set LK16 to position
A
•
Set LK17 to position
A
•
Plug the RS-422 test harness (as shown above)
into the com ports at TB1 and TB2 as shown
here:
Hardware Setup for RS-485 Testing
To create the test harness for RS-422 communications
loopback testing, use the following example:
Set the Quantum™ 4 communications jumpers as follows:
•
Set LK11 to position
B
•
Set LK16 to position
B
•
Set LK17 to position
B
•
Plug the RS-485 test harness (as shown above)
into the com ports at TB1 and TB2 as shown
here:
RS-485 Test Configuration
PL2
LK11
LK16
TB1
TB2
4-Pin Connector
4
1
+RX/+TX
-RX/-TX
1
4
4-Pin Connector
RS-485 Test Harness
-RX/-TX
+RX/+T
4
1
1
4
4-Pin Connector
4-Pin Connector
RS-422 Test Harness
-TX
+TX
+RX
-RX
+RX
-RX
-TX
+TX
PL2
LK2
TB3
LK1
TB1
TB2
RS-422 Test Configuration
ON
DIP
1
2
3
4
5
6
7
8
SW1
PL1
1
2
3
COM-2
RS-
232
Verify the
jumpers in
these
locations.
D3
D2
D1
D6
D8
0
1
2
3
4
5
6
7
P
O
R
T
D4
D5
D7
D8
D10
D11
D12
D13
LK6
LK5
LK4
LK3
LK17
A
B
LK10
LK9
LK8
LK7
LK16
LK11
B
A
1
2 3
4
1
2 3 4
COM-1
RS-422/RS-485
COM-2
RS-422/RS-485
A
B
A
B
TB3
LK1
LK6
LK5
LK4
LK3
LK10
LK9
LK8
LK7
LK2
1
2
3
COM-2
RS-
232
1
2
3
4
COM-1
RS-422/RS-485
1
2 3 4
COM-2
RS-422/RS-485
ON
DIP
1
2
3
4
5
6
7
8
SW1
0
1
2
3
4
5
6
7
P
O
R
T
D4
D5
D7
D8
D10
D11
D12
D13
PL1
D3
D2
D1
D6
D8
B
A
A
B
LK17
Verify the
jumpers in
these
locations.
