Gossen MetraWatt P1500, Operating Instructions Manual

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28 GMC-I Messtechnik GmbH
7 Analog Interface
7.1 Connector pin assignments
Interface
Type Circuit Diagram Func-
tion Termi-
nal Meaning
TRG
TRG 1 +
TRG 1 –
TRG 2 +
TRG 2 –
1
2
3
4
Trigger Inputs
• Floating digital control inputs for controlling a device function defined by
SEtUP/dPYIF/AnIF/trG 1 txt and SEtUP/dPYIF/AnIF/trG 2 txt
• Low signal: –18 V

Us

+ 1 V
• High signal: + 4 V

Us

+ 18 V
• Current consumption: Is = (Us – 2 V) / 1.47 k

SIG
SIG 1 +
SIG 1 –
SIG 2 +
SIG 2 –
SIG 3 +,
AGND 2
5
6
7
8
9
10
Signal Outputs
• Two floating digital status signal outputs
• One digital status signal output with reference to AGND (2)
• SIG 1

, SIG 2

and SIG 3+ indicate the statuses defined by
SEtUP/dPYIF/AnIF/SiG 1 txt, SEtUP/dPYIF/AnIF/SiG 2 txt and
SEtUP/dPYIF/AnIF/SiG 3 txt.
• Signal type: open collector
• Max. switching voltage: 30 V DC
• Max. switching current: 20 mA
Interface
Type Circuit Diagram Func-
tion Terminal Meaning
U
H
+15 V
AGND 1
AGND 2
11
12
10
+15 V (output)
• This auxiliary voltage output (15 to 18.5 V DC with reference to AGND 1
or AGND 2) can be used to control the trigger inputs, or to supply power
to external components (e.g. reference element for generating control
voltages ).
• The output is equipped with electronic current limiting to approximately
60 mA, and is short-circuit proof to AGND 1 and AGND 2.
AGND 1 and AGND 2 (analog ground = reference point)
• Reference point for the analog and digital control inputs and outputs
• These terminals are internally connected to the minus pole of the power
output via a reversible fuse with a rating of 110 mA.
The following is recommended:
• Use AGND 1 as a reference for the analog terminals on the upper
terminal strip (pins 13 through 18).
• Use AGND 2 as a reference for the digital terminals on the bottom
terminal strip (pins 1 through 9).S
Q1
1.47 k
Q1
1.47 k
100
100
100
Q2
+T
Q2
Q2
+T
U
I
20 V
60 mA
15 V
+T