2 system connector pinout – Honeywell SC1000 User Manual
Page 36
page 36 008-0608-00
5.2 System Connector Pinout
The Limit Output pins and Function Input pins are electrically isolated from the rest of
the instrument.
The RS-232 and RS-485 communications pins are electrically isolated from the rest of
the instrument.
The RS-232 and RS-485 interfaces are exclusive; an instrument cannot have both.
Table 5-2: System Connector
Pin
Name
Function
Input/Output
Reference Pin
1
N/C
No Connection
N/A
2
RS-232 IN
RS-232 Data In
Input
7
3
RS-232 OUT
RS-232 Data Out
Output
7
4
CTS
RS-232 Clear to Send (connected to pin 5)
N/A
N/A
5
RTS
RS-232 Request to Send (connected to pin 4)
N/A
N/A
6
DSR
RS-232 Data Set Ready
Output
7
7
GND
RS-232/RS-485 reference
Reference
-
8
DCD
RS-232 Data Carrier Detect (not connected)
N/A
N/A
9
FUNC 2
Function Input #2:.Clear Peak/Valley & Limits
Input
19
10
FUNC 1
Function Input #1: Tare Off for all channels
Input
19
11
FUNC 0
Function Input #0
Input
19
12
RS-485 TB
RS-485 Transmit B
Output
7
13
RS-485 TA
RS-485 Transmit A
Output
7
14
L1
Limit 1 Output (Open Collector)
Output
19
15
L2
Limit 2 Output (Open Collector)
Output
19
16
L3
Limit 3 Output (Open Collector)
Output
19
17
L4
Limit 4 Output (Open Collector)
Output
19
18
N/C
No Connection
N/A
19
DGND
DGND (Digital Ground)
Reference
20
DTR
RS-232 Data Terminal Ready (not connected)
N/A
N/C
21
FUNC 3
Function Input #3: Tare On for all channels
Input
19
22
RI
RS-232 Ring Indicator (pulled up to 5V)
Output
23
N/C
No Connection
N/A
N/C
24
RS-485 RB
RS-485 Receive B
Input
7
25
RS-485 RA
RS-485 Receive A
input
7