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7
Using the Modem’s Header
To access the modem’s header on model 4575 remove the cover on the side of the unit
using the included wrench. The header is shown below:
The pins are defined in the table below for Models 4575 and 4576.
Pin
Num
Name
I/O
Volts
1
DSR#
O
0
V
On
1.8
V
Off
0
V
means
Data
Set
(Modem)
Ready
2
RTS
I
1.8V
to
25V
High
‐
25V
to
.6V
Low
High
means
Request
To
Send
3
CTS#
O
0
V
On
1.8
V
Off
0
V
means
Clear
To
Send
4
RING#
O
0
V
On
1.8
V
Off
0
V
means
Ring
5
Power
Out
O
3.92
V
On
3.92V
comes
from
a
high
‐
power
45