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TT5B/C Auxiliary Serial Port Operation
The TT5B/C auxiliary serial port offers more flexibility than the TT5A aux port. The
TT5B/C port is full duplex and has built-in hardware handshaking. The port can both
receive and transmit data simultaneously, and has two separate 250 byte buffers in
which to spool data flow in each direction. Software hand-shaking with X-ON/X-OFF
protocol is recognized by the aux serial transmitter and generated by the receive logic.
The protocol is enabled and disabled by the EXP bit in Setup Register 2.
Communications Format
Data bits/character
Parity Bit
Stop Bit
Baud Rate(s)
- 8
- None
- 1
- 110 to 19,200
SETUP Register Assignments
The auxiliary serial port is configured by the bits in Setup Register 4 of the TT5A or
Setup Register 6 of the TT5B and C. The operating mode and baud rate of the auxiliary
port are initialized at terminal reset, or power-up. If either value is changed via the
Setup mode, the terminal should be reset to invoke the new setup values. TT5A SR#4
is defined as follows:
TT5A SR#4
Bit #
Description
1
3
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
9600
4800
2400
1200
19,200
300
150
110
7
8
Operating Mode
0
1
0
1
0
0
1
1
Bi-directional
Output Only
Input Only
Not Allowed
2
Baud Rate