Card
Setup
Sealevel Systems
ACB-II
Page
3
Interface Selection
Note: Only one interface can be selected at a time.
RS-232
The RS-232 option is selected when the RS-232 driver and receiver are
installed at locations U17 (
1488
) and U11 (
1489
).
RS-422
The RS-422 option is installed when the RS-422/485 chips are installed at
U6 (
75173
) and U7 (
75174
) and the RS-232 chips are removed.
RS-485
The RS-485 option is installed when the RS-422/485 chips are installed at
U6 (
75173
) and U7 (
75174
). The output of the RS-422/485 driver is
capable of being
Active
(enabled) or
Tri-State
(disabled) for RS-485
compatibility. Header E2 selects whether the RS-485 driver is enabled by
the SCC signal
R
equest
T
o
S
end (RTS) or always enabled. With the
jumper installed, RTS enables the driver (RS-485). Removing the jumper
enables the driver regardless of RTS (RS-422). Refer to Appendix C for a
detailed description of RS-422 and RS-485.
IRQ Selection
The
ACB-II
has an interrupt selection jumper that should be set prior to
use. Consult the user manual for the application software being used to
determine the proper setting. E1 & E9 select the interrupt request for the
port. IRQ3, IRQ4, IRQ5, or no interrupt (removing all jumpers) can be
selected, depending on jumper position. If no interrupt is desired, remove
the jumper.
SCC
4
3
5
E1
E9
SCC
Figure 2 - Header E1 & E9, IRQ Selection (Shown in Factory Default)
