15.40
SEL-400 Series Relays Instruction Manual Date Code 20171006
Communications Interfaces
Direct Networking Example
To view the temperature measurements received from the SEL-2600A, issue the
MET T command, as depicted in Figure 15.8.
NOTE: In some SEL-400 series
relays, you must use MET RTD instead
of MET T.
The MET T command displays the following messages:
➤ Channel Failure: This message is displayed for each channel whose
channel status bit is not asserted.
➤ Channel Not Used: This message is displayed for each channel
whose channel type is set to NA.
When there is a status problem with the SEL-2600A RTD module, the MET T
command will respond with an informational message, as shown in Figure 15.9.
The four possible messages for status problems, with their interpretation, are
indicated in Table 15.30.
Direct Networking Example
This direct networking example demonstrates direct networking to the relay
using the Ethernet card. Figure 15.10 shows the Ethernet network topology. This
examples uses a SEL-421, but the same concepts apply to any SEL-400 series
relay.
=>>MET T <Enter>
Relay 1 Date: 05/17/2003 Time: 13:42:13.220
Station A Serial Number: 0000000000
RTD Input Temperature Data (deg. C)
RTD 1 = -48
RTD 2 = Channel Failure
RTD 3 = 0
RTD 4 = 24
RTD 5 = Channel Not Used
RTD 6 = 72
RTD 7 = Channel Failure
RTD 8 = 120
RTD 9 = Channel Not Used
RTD 10 = 168
RTD 11 = 192
RTD 12 = 216
Figure 15.8 MET T Command Response
=>>MET T
SEL-2600 Failure
Figure 15.9 MET T Command Response for Status Problem
Table 15.30 MET T Command Status Messages
Message Interpretation
SEL-2600 Failure RTDFL status bit asserted
Communication Failure RTDCOMF status bit asserted
No data available Port Protocol not set to RTD
Channel Failure RTDxxST status bit deasserted
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