CHAPTER 2: QUICK START
SNAP PAC S-Series User’s Guide
21
CONNECTORS, INDICATORS, AND PINOUTS
SNAP-PAC-S1 and SNAP-PAC-S1-FM
Status and Activity LEDs
Indicator
Description
S0
RS-232 serial activity
on port 0
S1
RS-232 serial activity
on port 1
S2
RS-485 serial activity
STAT
Startup status and
control program oper-
ational status
ACT
Ethernet network
activity
LINK
Link established with
Ethernet network
Port 0 for RS-232 serial
(DB-9 connector)
Pin
Description
Signal
Direction
1
DCD
In
2
RX
In
3
TX
Out
4
DTR
Out
5
COM
6
DSR
In
7
RTS
Out
8
CTS
In
9
RI*
In
* RI signal does not occur on
PACs with a microSD card slot
Ports 1 and 2 for RS-485
and RS-232 seria
l
Pin Description
Signal
Direction
Port 2 for RS-485 serial
(2-Wire)
1
TX/RX+
In/Out
2
TX/RX–
In/Out
3
SIG COM*
4
IRQ+
In
5
IRQ–
In
Port 1 for RS-232 serial
6
TX
Out
7
RX
In
8
GND
9
RTS
Out
10
CTS
In
* Isolated ground
Independent 10/100 Mbps Ethernet
interfaces (RJ-45 connectors)
8–32 VDC input power
(pluggable 3-pin connector)
Port 0 for RS-232 serial
communications (DB-9 connector)
with handshaking. Supports PPP by default;
for use with serial devices, configure the port
in PAC Manager.
Port 1 for RS-232 serial
communications (pins 6–10 of
pluggable 10-pin connector)
Port 2 for RS-485 serial
communications (pins 1–5 of
pluggable 10-pin connector)
DIP switches for RS-485 serial link
Controller reset button
STAT LED
Activity LED (Yellow)
Link LED (Green)
MicroSD card slot
Bias
Termination
