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RTS Enable for RS-485
Headers E3 and E4 select whether the RS-485 driver is enabled by the
UART signal Request To Send (RTS) or always enabled. With the jumper
installed, RTS enables the driver. Removing the jumper enables the driver
regardless of RTS. E3 controls Port 2 while E4 controls Port 1. This
jumper should only be installed if you are running the board in a multi-
drop polled environment such as RS-485. For normal point to point
RS-422, such as terminal emulation, remove this jumper. Figure 4 shows
both ports configured for RS-422 operation.
Figure 4 - Header E3 and E4, RS-485 Enable
Sealevel Systems Dual SIO
E3
1
E4
2
Card Setup
Page 4
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