Figure 13: COM1 location
COM1/2 are software selectable for RS-232 or RS-422/485 operation within
the Bios Setup. The RS485 output drivers can be enabled or disabled with the
DTR signal. An active DTR means the drivers to be enabled. When using the
RS422 setting the output drivers are always enabled and the DTR signal is not
used.
Table 12: COM1 pin assignments
Name RS232
Name RS422/485 (only
on rear)
P2200 (RJ45 on front
panel)
DSR TXD+
1
DCD TXD- 2
DTR RXD+
3
GND GND 4
RXD RTS- 5
TXD CTS+ 6
CTS CTS- 7
RTS RTS+
8
RI
RXD-
Not available on front
RJ45 cable (optional)
A short cable is optionally available to convert the RJ45 style RS232 (without
RI) mechanically/electrically to a Sub-D9 connector (see table below).
The pin assignment for this optional cable (YLR015RS) is shown below.
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