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3.2.5
CURRENT LOOP OPERATION
North Star HSIO-4
Most computers, terminals, and printers use
RS-232 signal levels.
terminals, such as teletypes, use 20 mA
current loop signals.
A teletype is a passive device; it does
not supply current, but relies on current
supplied by the HSIO-4. The HSIO-4 is not
equipped to communicate with active current
loop devices such as computers that produce
current loop signals.
As supplied, each HSIO-4 port is configured to
use RS-232 signals. To configure an HSIO-4
port for current loop operation:
1.
Install a mini-jump at the current loop
jumper area for the relevant port. See
Table 3-4 below.
CURRENT LOOP JUMPER AREAS
Port
33
A few commercially used
Table 3-4
Jumper Area
A
JP5
B
JP6
C
JP7
D
JP8
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