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5.3 Wiring
The Options connector is the bottom connector on the instrument’s rear panel. To
determine which options have been factory installed into the instrument, examine the
“order code” field of the instrument’s serial number tag.
The RS-232 / RS-485 communications pins are electrically isolated from the rest of
the instrument.
5.3.1 2 Form C Relays
Option
Table 5-5: Options Connector with Option 58a (2 Form C Relays)
Pin
Label
Function
Reference
Pin
Availability
1 (left)
OUT/+TX
RS-232 Data Out (Option 53a)
RS-485 Tr (Option 53d)
5
Option 53a
or 53d
2
IN/-TX
RS-232 Data In (Option 53a)
RS-485 Transmit - (Option 53d)
5
Option 53a
or 53d
3
DSR/+RX
RS-232 Data Set Ready (Option 53a)
RS-485 R (Option 53d)
5
Option 53a
or 53d
4
-RX
RS-485 Receive -
5
Option 53d
5
GND
RS-232/RS-485 reference
-
Option 53a
or 53d
6
N/C
No Connection
-
7
RELAY1 NC
Relay 1 normally closed
8
Option 58a
8
RELAY1 COM
Relay 1 common
-
Option 58a
9
RELAY1 NO
Relay 1 normally open
8
Option 58a
10
RELAY2 NC
Relay 2 normally closed
11
Option 58a
11
RELAY2 COM
Relay 2 common
-
Option 58a
12 (right)
RELAY2 NO
Relay 1 normally open
11
Option 58a
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