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C • TTL and Relay Control
Doc. 065291-01 3/09 245
C.2 Controlling TTL and Relay Outputs
The ICS-2100 provides two TTL outputs and two relay contacts for control of
functions in external devices, such as an integrator or autosampler. The relay
outputs can be used to switch any low-voltage control. Switched current must be
less than 200 mA and 60 V peak blocking. The relay-contact closures are
normally open. When the relay is closed, current flows to the connected device.
The TTL outputs are normally at 5 volts. Setting a TTL output to 0 volts turns on
the action in the connected device.
The TTL and relay output states can be controlled from Chromeleon, either by
issuing direct control commands from the Chromeleon Control panel or by
including the commands in a control program.
To control the TTL and relay output states from the touch screen, select
INPUT/OUTPUT from the menu of pages. The INPUT/OUTPUT page appears (see
Figure C-4
).
• To set a relay, touch the relay field and select the desired state (Open or
Closed). For example, if Relay 1 is connected to the Load input on the
autosampler, touch the
Relay 1 field and select Closed to start the load cycle.
• To set a TTL outputs, touch the TTL field and select the desired state (5Volts
or
0Volts).
Relay loads in excess of 200 mA or with included power supplies over
60 V may damage the relay drivers on the CPU.