HARDWARE
5
COMPONENT LISTING
AT Communications PC Board (A12)
INDICATOR LIGHTS:
D1
Status LED - SPI Communication
D2 RXD - Serial Receive LED
D3 TXD - Serial Transmit LED
D4 ACT - Ethernet Activity LED
D5 SPEED - Ethernet 10/100 LED
D6 LINK - Ethernet Link Status LED
CONNECTORS / JUMPERS:
J20
Power Supply Connection
J21 Factory Connection
J22
RS-85 Terminating Resistor
(enable/disable)
P13
Plug for Main Control Board (A1)
SWITCHES:
S1
Configuration
Switches
S2
Modbus Address
SW10 RESET Push Button
USER CONNECTIONS:
J1
RJ45 Ethernet Connection (
opt
)
TB10
RS-485 Serial Connection
TB11
RS-232 Serial Connection
Figure 2
EN5004-0
#
AT Series
Communications PC Board (
A12
)
T
B
10
PO
S(
+)
N
EG
(-)
CO
M
T
B
11
RDX
TD
X
CO
M
RT
S
CT
S
3.2 Serial Connections
The communications option supports RS-232 and RS-485. RS-232 is a standard serial
communication, used on personal computers. It has a limited cable distance and is
susceptible to electrical noise. RS-485 serial communications allow longer distances and
allow multiple devices to be connected to the same serial network. Terminal Block (TB10) is
for the RS-485 connections, and Terminal Block (TB11) is for the RS-232 connections.
3.2.1 RS-232
Set configuration switch S1-5 to
OFF
to select RS-
232. Configuration switch S1-6 enables or disables
the RTS and CTS handshaking lines. Terminal block
TB11 User Connection
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
RDX
TDX
COM
RTS
CTS
TB11 is for the RS-232 user connections. In each section for RS-232 3-wire and 5-wire
installation, a typical connection diagram is shown. Each diagram shows the pin-out used
for a standard personal computer (PC) for either a 25-pin or 9-pin serial connection.
