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Interface Selection
The Route 56 supports a variety of electrical interfaces. These interfaces may
be selected in two ways. The determining bit is found at Base+5, bit position
D4, and is identified as IFSEL (InterFace SELect). Reference the
Control/Status Register Descriptions, found in the Technical Description section
of this manual for this bit description. When IFSEL = 0, then the values read
from M3-M0 are determined by the DIP-switch SW2. If all the switches on
SW2 are off, then all drivers and receivers are in a high impedance state. Only
one switch should be set to the on position at a time. The following example
illustrates SW-2:
ON
OFF
When IFSEL = 1, then the values read from M3-M0 are determined by values
written to base+5 register. If this method is utilized, all switches on SW2
should be set in the off position, unless a default value is required. This
prevents the application of excess voltages on power-up to external receivers.
The following table shows the valid options.
HEX
M3
M2
0
0
0
1
0
0
2
0
0
3
0
0
4
0
1
5
0
1
6,7,8,9
0
1
A
1
0
B
1
0
C
1
1
D
1
1
E
1
1
F
1
1
Sealevel Systems ROUTE 56
1 2 3 4 5 6
M1
M0
INTERFACE MODE
0
0
all signals are high impedance
0
1
* not supported *
1
0
RS-232
1
1
* not supported *
0
0
RS-485 with 120 ohm termination
0
1
RS-485 without termination
1
0
* not supported *
1
0
single ended loop-back
1
1
differential loop-back
0
0
* not supported *
0
1
RS-530
1
0
V.35
1
1
RS-530A
Card Setup
Page 3
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