The schematic is shown in Figure 4-1. The function of each jumper and test point is listed in Table 4-1.

Power and logic signal go through the J1 connector. Table 4-2 lists each pin’s connection.

The female DB9 port (Figure 4-2) provides access to the TRS3232RGT device through a standard RS-232 pinout. The TRS3232RGT female port is DCE to mate with a computer's male DTE port. The pin names are counterintuitive on the DCE side. For example the RX pin on EVM is connected to a driver and TX connects to a receiver. The pin connection is listed in Table 4-3. The reason pins 4 and 6 are shorted together by a 0 Ω resistor is to loopback the unused handshaking lines.