Serial Ports; Table 3-7 Signal Sets Per Port In Available Modes; Figure 3-2 Rs422/485 Signal Definition - GE IMP2B Hardware Reference Manual

3.8 Serial Ports

The MV64560 provides two UART serial ports: port 0 is used for COM1 and port 1 is
used for COM2. Both ports support asynchronous differential operation (RS422) as
well as RS232, with the required operation being software configured through the
EPLD
for use as a debug port. Both ports are disabled at power-up.

Table 3-7 Signal Sets Per Port in Available Modes

RS232
TXD
RTS
RXD
CTS
For RS422 outputs, the non-inverting output of the differential pair is designated 'B'
and the inverting output is designated 'A'.

Figure 3-2 RS422/485 Signal Definition

The ports use a single Intersil IS41334 transceiver and are capable of operation up to
400 kBaud in RS232 mode and up to 10 MBaud in RS422 mode (reducing to 8 MBaud
over temperature).
Both ports are available as rear I/O from the
24 IMP2B 3U cPCI Single Board Computer
Control Register 2. The default configuration of COM1 is single-ended (RS232)
RS422
TX_A
TX_B
RX_A
RX_B
J2 connector.
Publication No. IMP2B-0HH/5