Page | 15 Revision 1.4 15 January
2015
Expansion connector
The EXPANSION connector on the rear of LabSat 3 gives access to a number of signals including CAN Bus,
RS232, 1PPS & Digital input/output. Accessory RLACS202 is used to provide user signal access for
integration into the users test system. Pin functions are as follows:-
Number Name
I/O Function
1 1PPS
O
Signal from Internal GNSS monitor. Becomes active when monitor is locked.
5V Level. 25mA
2 DIGO
O
User digital output. 5V Level. 25mA max
3 DIGI
I
User digital input. Up to 12 V input level. Detection threshold=2.5V
4 -
5 -
6 -
7 -
8 -
9 -
10 CAN 1 H
I/O
CAN Bus High Channel 1 – Standard ISO11898 voltage signal levels for CAN
11 CAN 1 L
I/O
CAN Bus Low Channel 1 – Standard ISO11898 voltage signal levels for CAN
12 CAN 2 H
I/O
CAN Bus High Channel 2 – Standard ISO11898 voltage signal levels for CAN
13 CAN 2 L
I/O
CAN Bus Low Channel 2 – Standard ISO11898 voltage signal levels for CAN
14
I2C SDA
I/O
I2C Bus Data – Reserved for future use
15
I2C SCL
I/O
I2C Bus Clock – Reserved for future use
16
I2C VCC
I/O
I2C Bus voltage level – Reserved for future use
17 RS232 Tx
O
RS232 data output. NMEA Data from GNSS monitor or User RS232 data if
enabled. Standard RS232 Level.
18 RS232 Rx
I
User RS232 data which is recorded if RS232 is enabled in Digital configuration
menu. Standard RS232 Level.
19 Ground
O
Ground Connection
20 Ground
O
Ground Connection
21 Ground
O
Ground Connection
22 -
23 -
24 -
25 -
26 -
27 -
28 IO_0
I/O
Reserved
29 IO_1
I/O
Reserved
30 IO_2
I/O
Reserved
31 IO_3
I/O
Reserved
32 -
33 Ground
O
Ground Connection
34 Ground
O
Ground Connection
35 Power
O
Connected to input power – Max 250mA
36 Power
O
Connected to input power – Max 250mA
