Doc. 065215-02 9/09
101
C • TTL and Relay Control
A 12-pin connector strip for TTL/relay control is located on the ICS-900 rear
panel. The connector provides two relay outputs, two TTL outputs, and four TTL
inputs (see
TTL and relay outputs can be used to control functions in external devices, such
as an autosampler or another Dionex module. Relay outputs 1 and 2 can be
programmed to switch any low-voltage control. Switched current must be less
than 200 mA and 60 V peak.
Relay outputs 1 and 2 can be configured to close when the pump flow is on and
open when the pump flow is off, thus ensuring that a connected device is turned
off when the pump flow is off. See
for details.
Figure C-1. TTL and Relay Connector on Rear Panel
Relay loads in excess of 200 mA or with included power supplies over
60 V may damage the relay drivers on the instrument’s CPU board.
1
2
OUT
RELAY
(+)
TTL OUT
1
2
TTL GND
(-)
1
2
3
4
TTL IN
(+)
1
2
Description
Solid State Relay Contacts Output
Pin Function
Solid State Relay Contacts Output
TTL Output 1 (1 k pull up to +5, 100 mA sink)
Ω
TTL Output 2 (1 k pull up to +5, 100 mA sink)
Ω
Ground
Ground
TTL Input 2
⎯
Inject/Load
TTL Input 3
Pump
On/Off
⎯
TTL Input 4
Autozero
⎯
Note:
These are the
default TTL input
function assignments.
Functions can be
reassigned to any input.
TTL Input 1
⎯
Autozero
