Themis NanoPAK, User Manual

Page: 44 / 156

2-12
Themis Computer
NanoPAK
®
User Manual Version 1.0
2.3.2.2 COM B
COM B only runs in RS232 mode, with no control signals, only TXD and RXD. The
maximum baud rate is 115200 baud.
2.3.3 General Purpose I/O
There are 4 General Purpose Inputs and 4 General Purpose Outputs, (GPIO), avail-
able at the 69-pin connector J1. (On systems with SATA capability, 2 of each of
these ports, GPI2/GPO2 and GPI3/GPIO3, share pins on J1 with the RS232 modem
control signals in order to make connections available for the SATA pairs.) These
signals are at 3.3V logic level, routed to and from the COMExpress
®
connector on
the carrier board through buffers. Refer to Table A-1 on page A-2 of Appendix A for
Figure 2-9. RS485 Half-Duplex Bus Configuration