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MODEL 64000
SYSTEM OVERVIEW MANUAL
To terminate the file, a record beginning and consisting solely of
ET
(binary 4) is expected
for source files or a null (binary 0) for other file types. If the system has received an end of
record, no other information is received, and the system will automatically time out after 10
seconds.
Software Handshake Conventions
In receive mode, the 64000 will output an X-ON (ASCII DC-1) until data is received. Also,
after each record is read, it will generate an XX-OFF (ASCII DC-3) while storing the record
followed by an XX-ON to signal ready. If used, this can allow the 64000 to run at maximum
speed; otherwise, 1200 baud is the maximum advised speed.
In transmit mode, the 64000 will listen to the X-ON, X-OFF convention described above.
Once an X-OFF is received it will wait for an X-ON before it continues to transmit. This
convention is not necessary, and if it is not used, transmission will continue as if the
receiving end can maintain the selected baud rate. Software handshake timing is shown in
figure 2-36.
PROTOCOL
ASCII
BINARY
HEX
X ON
DC-1
0001
0001
11
X OFF
DC-3
0001
0011
13
50 TIMES MAX
WRITE TO DISC
100mS
/
/
-TX--~10-0-0-1--0-00-1~1 ~~10~00-1--~00~0-1~1---J1~--~~1~0~0~0:1~~0~0~1~1~1~1rrI0~0~0~1~0~0~10~1
d1
d1
Rx
NO NEW
RECORDS ACCEPTED
r
d3
d1
FIRST CHANCE TO
RECORD NEXT RECORD
FIRST RECORD
NOTE:
RECEIVER TIMES OUT (AFTER 3 SECONDS). TIMER WILL BEGIN ONLY AFTER FIRST RECORD IS
RECEIVED.
INITIATED COpy RS-232 TO <FILE>
Figure 2-36. Software Handshake Timing
2-69
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