ASE2000 V2 Communication Test Set User Manual 37
Ignore Post-Msg
Noise
Can eliminate noise caused when external modems shut down. If enabled, the
ASE2000 discards all input data received after it determines that a complete
message has been received. Discarding continues until the incoming carrier
(DCD) drops
Native Asynch
Mode
For byte protocols such as DNP3, there are two ways to operate an ASE
manufactured serial card: Bit Mode and Native Asynch Mode. Bit mode provides
the ASE2000 with control over low level timing properties, but can result in extra
communication errors at higher baud rate. Native Asynch Mode operation may
remove these communication errors
Pre-Xmit Mark For switched carrier operation, speciîš¿es the time, in milliseconds, between
detection of CTS and transmission of the îš¿rst data bit
Post-Xmit Mark For switched carrier operation, speciîš¿es the time, in milliseconds, between
transmission of the last data bit and de-asserting RTS
Preference This option is applicable to insertion of pre-mark and post-mark times in
transmission of legacy (bit) protocol messages. Because of hardware operation,
the actual inserted time may exceed the sum of the entered times by as much
as 7 bits (i.e., the time required to transmit 7 bits). The ASE2000 has the option
of assigning this excess to the pre-mark time, the post-mark time, or both. The
Preference option can be used to specify one of these two times to be transmitted
as accurately as possible. Any excess time will be assigned to the non-speciîš¿ed
time. (For no speciîš¿cation, half the excess time is assigned to each).
In practice, we have found this option to be useful only for old CDC protocol
devices, which operates best by selecting Post-Mark
Receiver Squelch Used for reception of data in switched carrier mode. Deîš¿nes a time, in
milliseconds, starting on incoming carrier (DCD) detection. Data received during
this time is discarded
Inter-Message A minimum time between ASE2000 transmissions of consecutive messages.
Does not apply to messages received by the ASE2000. This setting applies to all
messages except the Operate message in a select-before-operate sequence
Intra-Message Similar to the Inter-Message delay explained above, applies only to the Operate
message in a select-before-operate sequence
Response Time the ASE2000 waits for a response from the RTU before declaring a
response timeout
Character Gap Time in seconds the ASE2000 should add between characters when calculating
how long to wait for a response from the RTU before declaring a response
timeout
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