The Fredericks Company RS485 User manual

The Fredericks Company l 2400 Philmont Ave ● HuntingdonValley, PA 19006-0067
Tel: [phone] l Fax: [phone] l Email: sale[email protected] l www.frederickscom.com
1-6200-008_im Revision: B
Page 1 of 4
Operating Manual
1-6200-008
RS485 mini signal conditioner board
1. PRODUCT DESCRIPTION
The RS-485 signal conditioner utilizes Fredericks single and dual axis electrolytic tilt sensors. The
signal conditioner provides the necessary excitation to the sensor and signal conditioning of the
output to communicate over a RS485 interface.
Standard industrial RS-485 interface enables long transmission distances and possibility to connect
multiple modules, with individual addresses, to the same bus. In addition to tilt angle, temperature
information is also available from the module that can be used for temperature compensation of
the sensor.
2. INSTALLATION
2.1 Mounting
The board in mounted in a horizontal position when a sensor in installed into the board. If external
single axis sensors are connected thru cables, then the board can be mounted in any position.
Following are the board dimensions,
Board dimensions...................................................1.25 x 1.25 inches or 32mm x 32mm square
Mounting hole and spacing..................0.089 inches diameter and 1.05 inches (center to center)
2.2 Electrical connections
Below is a table of the power and signal pin-outs,
Pin #
Signal name
Direction
Description
1
Vcc
Input
Supply voltage input: +3 to +5 vdc regulated
2
GND
-
Ground - The reference for the digital signals and the supply voltage
3
GND
-
Ground - The reference for the digital signals and the supply voltage
4
TX
Bi-directional
RS485 –B
5
RX
Bi-directional
RS485 –A
6
GND
-
Ground - The reference for the digital signals and the supply voltage
7
GND
-
Ground - The reference for the digital signals and the supply voltage
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The Fredericks Company l 2400 Philmont Ave ● HuntingdonValley, PA 19006-0067
Tel: [phone] l Fax: [phone] l Email: sale[email protected] l www.frederickscom.com
1-6200-008_im Revision: B
Page 2 of 4
2.3 Board layout
Below is a drawing showing the board layout,
Sensor configuration
Description
Dual Axis sensor mounted
on board
(standard configuration)
Dual axis sensor is mounted in location L1
R5 is 10.0K ohms
R6 is not installed
Single axis sensors
mounted off board
Single axis sensors are connected to J3 (x-axis) and J4 (Y-axis)
No sensor is installed in L1
R5 is not installed
R6 is 1.0K ohms
Note: If R5 is not removed then R6 must be less than 100 Ohms
Note: J2 is for factory use only.
J1 SIGNAL CONNECTOR
PIN 1
J3 X-AXIS
X-axis
X-AXIS
J4 Y-AXIS
AAAAAXIS
AXIS
L1
DUAL
AXIS
SENSOR
SENSOR
R6
R5
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The Fredericks Company l 2400 Philmont Ave ● HuntingdonValley, PA 19006-0067
Tel: [phone] l Fax: [phone] l Email: sale[email protected] l www.frederickscom.com
1-6200-008_im Revision: B
Page 3 of 4
2.4 Data-bus connections
Before connecting the modules to the bus, make sure they all have different addresses (see 3.3
command 81). Connect all ‘A’ of each module and all ‘B’ of each module.
NOTE: RS485 cannot be connected to RS232 interface.
MASTER MODULE MODULE MODULE MODULE
]-------------------------A-------------A-------------A - - - - - - - - - A
]-------------------------B-------------B-------------B - - - - - - - - - B
Max 32 modules in one bus
If communication fails to work, switch A and B polarity at Master end
2.5 Communication setup
For communication, use e.g. Hyper-terminal software (standard in MS Windows). The following
parameters are either fixed or factory default for setting up the communications.
Function
Setting
Comments
Baud rate
9600
(factory default)
Settable from 1200 to 38400
Number of data bits
8
Fixed
No parity
N
Fixed
Number of stop bits
1
Fixed
3. COMMANDS
3.1 Command format
The following is the command format to read the sensor output and board temperature
*XXYY# (* = start of string, XX = address, YY = command, # = end of string)
a. Data commands
Command description
Command
Output
X axis data
*9911#
ascii (16 bit)
Y axis data
*9921#
ascii (16 bit)
Board temperature
*9941#
ascii (10 bit) see note
NOTE: To convert the 10 bit data returned from the on board MCP9700 use the following formulas,
MCP9700 output voltage = 10 bit value / 1023 * supply voltage
Temperature C = (MCP9700 output voltage –0.5) / 0.010
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The Fredericks Company l 2400 Philmont Ave ● HuntingdonValley, PA 19006-0067
Tel: [phone] l Fax: [phone] l Email: sale[email protected] l www.frederickscom.com
1-6200-008_im Revision: B
Page 4 of 4
3.3 Setup commands
Command
Command description
Output
*9980#
Read product information
Fredericks
RS485 signal conditioner
Ver 1.0
*9981Axx#
Change address
(xx = address 01 to 99)
Returns new address
*9982Sxxxxxxxxxxxx#
Enter user information
x- must be exactly 12 characters.
alpha/numeric, –and SP are acceptable
Returns ID
*9982D#
Read user information
Reads the information entered by the user
*9984Z#
Zero unit to current position (Ver 2.0)
Zeroing
*9984R#
Reset zero- clears offset value (Ver 2.0)
Resetting zero
*9988Rx#
x –code for baud rate
Code
Rate
1
1200
2
2400
3
4800
4
9600
5
19200
6
38400
none
*9989B#
Reset to factory defaults
Address = 99
Baud rate = 9600
none
Note: There is a hardware reset if the baud and/or address is unknown. This is done by placing a
short on R9 on the PCB before powering the unit. After power is applied remove power and short.
This will reset the unit to the default values. Refer to 2.3 board layout for R9 location.
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