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A 12-pin connector strip for TTL/relay control is located on the Dionex Easion
rear panel. The connector provides two relay outputs, two TTL outputs, and four
TTL inputs (see
Pin Function
1
RELAY
OUT
2
TTL OUT
(+)
TTL IN
(+)
TTL GND
(-)
Relay loads in excess of 200 mA or with included power supplies over
60 V may damage the relay drivers on the Dionex Easion's CPU board.
TTL and relay outputs can be used to control functions in external devices (for
example, an autosampler). 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. For more information, see
Doc. 155028-01 08/20
C • TTL and Relay Control
Figure
C-1).
Description
Solid State Relay Contacts Output
Solid State Relay Contacts Output
TTL Output 1 (1 k
1
TTL Output 2 (1 k
2
TTL Input 1 Autozero
1
TTL Input 2 Inject/Load
2
TTL Input 3
3
TTL Input 4
4
Ground
1
Ground
2
Figure C-1. TTL and Relay Connector
pull up to +5, 100 mA sink)
pull up to +5, 100 mA sink)
Note: These are the
default TTL input
function assignments.
Pump On/Off
Functions can be
reassigned to any input.
Autozero
Section
C.3.
93
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