Cocoon POWERTALK 101 - Manual (Page 41)

PowerTALK 101
40
Easy functionality test - Loopback test:
A terminal program is used to send a character through a set of PowerTALK units, through the
loopback connector, and then echoed back to the terminal program. The complete loop is
functional if the echo is visible.
“A”
input “A”
“A”
echo
loopback
Serial 1 PowerTALK 101 A
Ethernet
Channel 1
PowerTALK 101 B Serial 1
Schematic loopback test
•
A character is sent from HyperTerminal on the PC COM port into the Serial 1 port on
PowerTALK 101 “A”
•
The character is packetised and sent from PowerTALK 101 “A” to “B” over Ethernet, on
channel 1 (Serial 1 is configured onto channel 1)
•
PowerTALK 101 “B” receives a packet on channel 1, destined for Serial 1 (Serial 1 is
configured onto channel 1)
•
PowerTALK 101 “B” strips the packet, and outputs the character to its Serial 1 port.
•
PowerTALK 101 “B” Serial port 1 has a loopback connector, and the bits are bounced back
into Serial 1.
•
The character is once again packetised and sent from PowerTALK 101 “B” to “A” over
Ethernet, on channel 1 (Serial 1 is configured onto channel 1)
•
PowerTALK 101 “A” receives a packet on channel 1, thus destined for Serial 1 (Serial 1 is
configured onto channel 1)
•
PowerTALK 101 “A” strips the packet, and outputs the character to its Serial 1 port,
connected to the PC COM port.
•
This character will then be displayed as an echo on the HyperTerminal screen.
•
Removing the loopback plug, or inserting it into the incorrect channel/port will stop the echo
from occurring.
“A” “A”
“A” “A”