Themis USPIIi-1v, Hardware Manual

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USPIIi-1v Hardware Manual
A-16
Themis Computer
A.3.2 Serial Port C (TTYC or Console) and Serial Port D (TTYD or Aux Port)
In Sun mode, the two baseboard serial ports (ports A and B) are used by the keyboard and mouse logic,
respectively. Therefore, serial Port C becomes the software console port (also know as TTYA) and serial Port
D is the auxiliary port (TTYB).
In PS/2 mode, all four serial ports are available: ports A and B on the baseboard, port C and D on the I/O
board. Corresponding software acronyms are Console (or TTYA), TTYB, TTYC and TTYD, respectively.
Ports C and D can be configured in RS232 or RS422 mode by means of jumpers JP0705, JP0706, JP0801-
JP0808. Default setting is RS232. Also, they can be set to synchronous mode by means of jumpers JP0703-
0704. Default is asynchronous. See Appendix Table B-2., "I/O Board Jumper Setting," for details.
Note — In RS232 mode, only negative signals are used. They are referenced in Appendix Table A-12., "I/
O Board TTY C AND TTY D Pinout," with a minus sign.
• Connector Type: Dual Stacked, 0.050, 26 pin, Sub D, Amplimite Slimline Connector
• Connector Part Number: AMP 786200-1
Figure A-10. I/O Board TTYC and TTYD Connector Orientation
Table A-12. I/O Board TTY C AND TTY D Pinout
Pins TTY C Signal Name Pins TTY D Signal Name
1 CHGND 27 CHGND
2 TXD- 28 TXD-
3 RXD- 29 RXD-
4 RTS- 30 RTS-
5 CTS- 31 CTS-
6 NC 32 NC
7 GND 33 GND
8 DCD- 34 DCD-
9 RXC+ 35 RXC+
10 DCD+ 36 DCD+
52
Front View
of PCB
1 13
39
TTYC
TTYD