FASTRAK MANUAL
Rev. G
17
JUNE 2012
The
) may be used to override the switch settings during
operation and select other baud rates. Although it is possible to save the new baud rate with the
‘^K’ – *Save Operational Configuration
command (see page
, the next time you power up (or
re-initialize the system with the
command [page
]), the system
will ignore the EEPROM baud rate setting and read the dip switch settings to operate at that baud
rate.
NOTE:
High baud rates such as 115.2K generally require a short, well-made RS-232 cable in
order to achieve error-free performance. (The Hardware Handshake function has been
discontinued in this FASTRAK version. Switch #4 has no effect.)
The Parity select logic for switches 6 and 7 is as follows:
Parity
6
7
None
0
0
Odd
1
0
Even
0
1
Not used
1
1
–
Caution:
System will not operate in this position
Figure 7-3 Default I/O Select Dip Switch Settings
7.6 External Sync I/O
The External Sync I/O module is located on the rear panel of the SEU as shown in
The connector contains two modular telephone sockets with the one closest to the I/O Select
Switch being “Sync In”. The input signal must be a single-ended TTL signal. If the output is
employed in the user’s system, it should be interfaced with differential TTL circuitry. The Sync
Out signals are also compatible with RS-422 specifications. The signal logic is as follows:
Input: START = Logic LOW to HIGH transition, 50 µsec. pulse, min.
Output: START = Logic LOW to HIGH transition, 50 µsec. pulse, min.
NOTE:
The “Sync Out” feature is no longer available on FASTRAK models
produced as of January 2012.
The pin assignments for each plug are as follows and their numbering is shown in