Pythia Technologies MS0-MBT User manual

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Micro Server Level 0 for Modbus (MS0-MBT)
User Guide
7/2016

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Table of Contents
CHANGE HISTORY ........................................................................................................................................... 3
1. INTRODUCTION...................................................................................................................................... 4
2. TERMINAL BLOCK CONNECTOR............................................................................................................. 4
2.1 RS-422 4-WIRE ................................................................................................................................ 4
2.2 RS-485 2-WIRE ................................................................................................................................ 5
3. IP ADDRESS AND SERIAL PORT CONFIGURATION................................................................................. 5
3.1 NETWORK CONFIGURATION ................................................................................................................. 5
3.2 SERIAL PORT CONFIGURATION.............................................................................................................. 8

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Change History
Date
Version
Change
August, 2012
2
Update to latest standards
February, 2015
3
Latest drawings
July, 2016
4
Updated for new firmware release

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1. Introduction
The Pythia Tech MicroServer Level 0 for Modbus (MS0-MBT) provides data translation for Modbus/RTU
to/from Modbus/TCP. The User Guide provides assistance with connecting and configuring your MS0 to
your equipment.
Device 1
Device 2
Device 3
Device 4
Modbus RTU
Modbus RTU
Modbus TCP
Modbus TCP
2. Terminal Block Connector
By default, the terminal block connector is configured for RS422 2-wire. The labeling of the connector
represents the Modbus slave device connections. To simplify wiring, the connector’s TX/RX lines are
swapped internally.
2.1 RS-422 4-wire
Connector
Modbus Device
2-pair STP, 18-24ga.
4-wire
Master Device
UP
Gnd
Rx+
Rx-
Tx+
Tx-
POWER
n/a
GND
GND
RX+
RX+
RX-
RX-
TX+
TX+
TX-
TX-

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2.2 RS-485 2-wire
Note: The RX/TX+ wires are connected and the RX/TX- wires are connected as shown below.
Connector
Modbus Device
2-wire
Master Device
Gnd
Rx+
Rx-
Tx+
Tx-
DOWN STP, 18-24ga.
POWER
n/a
GND
GND
RX+
n/a
RX-
n/a
TX+
+
TX-
-
3. IP Address and Serial Port Configuration
The IP address and serial port can be configured using a network cable and your computer.
The default configuration for the MS0 is:
IP address: 169.254.254.1, 255.255.0.0
Serial port: RS485 2-wire 9600,8,N,1
3.1 Network Configuration
Your computer must be configured with a static IP address. Connect the network cable to your computer
and to the MS0. Configure your computer with 169.254.254.100, 255.255.0.0.
Launch the your Telnet program
Enter “169.254.254.1” for the IP address, “9999” for the port number.

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When prompted, press the “Enter” key”
Enter “1” to change the IP address
Enter the IP address configuration provided by your network administrator. For example:
10.0.0.100, 255.255.255.0, 10.0.0.254
IP address configuration is complete. If additional changes are required, repeat the above steps.

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Enter “2” to change the Serial and Mode Settings. For example: MS0 is connected to Modbus
Slave device using Modbus/RTU with communication settings RS-485/2-wire 19200,8,N,1.
oEnter “1” for Modbus slave device
oEnter “1” for Modbus/RTU
oEnter “3” for RS-232, “2” for 4-wire or “3” for 2-wire.
oEnter the serial parameters 19200,8,N,1.
Other Serial Parameter Examples: 9600,8,N,1 9600,8,E,1 38400,8,N,1 19200,7,E,1
Serial and Mode settings is complete
NOTE: Do not change the “Advanced Modbus Protocol settings”unless directed to by factory
support.
Enter “S” to save the changes and to restart the MS0.
Remove the direct connected network cable and plug the MS0 into a network switch.
If you changed your computer’s IP address configuration, change it back to the original settings.

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Plug your computer into a network switch and “PING” the MS0 to verify network
communications.
3.2 Serial Port Configuration
To use the serial port configuration method, your computer must have a serial communications port –
either an internal port or external USB port.
Remove the terminal block connector from the MS0

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Connect a DB25M straight-thru serial cable to the computer serial port and the MS0’s DB25 port.
Disconnect power from the MS0.
Launch and configure your serial communications program for 9600,8,N,1.

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Connect/Open the communications session. NOTE: DO NOT POWER ON MS0 YET.
Simultaneously, press and hold the “X” key and power on the MS0.
NOTE: The MS0 must be power cycled and the “X” key held down to enter setup mode.
When prompted, press the “Enter” key” and following the instructions above for configuring the
MS0.
© 2016 Pythia Technologies, Inc. All rights reserved. No part of this document may be transmitted or reproduced in any
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