Using Powerlink® G4 Controllers in Pass

Using Powerlink® G4 Controllers in Pass
Data Bulletin
1210DB1402
06/2014
Using Powerlink® G4 Controllers in Pass-Through Mode
®
with Modbus TCP Ethernet Communications Protocol
Retain for Future Use
ABOUT THIS BULLETIN
This bulletin provides technical data and information about using Powerlink® G4 Controllers in
pass-through mode from Modbus® TCP Ethernet communications protocol to RS232 or RS485
serial ports and RS232 to RS485 ports.
SETUP
To access the pass-through mode on the Powerlink G4 controller, follow these screens to the
Serial Comms setup screen from the controller front:
Step 1:
Step 2:
Step 4:
Step 5:
Step 3:
Modbus TCP Ethernet to RS485 or RS232 Ports
The pass-through mode from MB/TCP to RS232 or RS485 allows Modbus Serial devices to be
addressed through the Powerlink G4 Controller. Up to 8 devices are supported on the RS485
serial chain. The pass-through device (Powerlink G4 Controller) will pass through all Modbus TCP
requests that are not the controller's serial ID or device ID. All requests that are passed through
are converted to Modbus RTU and transmitted out the RS232/RS485 serial port. Replies from the
serial device are converted back to a Modbus TCP packet and transmitted out to the network via
the Ethernet port.
© 2014 Schneider Electric. All Rights Reserved.
Using Powerlink® G4 Controllers in Pass-Through Mode
Data Bulletin
1210DB1402
06/2014
From the Serial Comms setup screen, follow the steps in the "Modbus TCP Pass-through to
RS232 to RS485" table to setup pass-through mode from Modbus TCP to RS232 or RS485.
Table 1: Modbus TCP Pass-through to RS232 to RS485
Pass-through
Mode
Screen Example
Pass-through Mode Setup Steps
MB/TCP to RS232
1. Select "GATEWAY MB/TCP" under 232 Mode.
2. Select baud rate.
NOTE: See "RS232 2-Wire Communications Parameters"
table for baud rate information.
3. Select Modbus Address (MB Addr) to pass through to the
RS232 serial port.
MB/TCP to RS485
1. Select "GATEWAY MB/TCP" under 485 Mode.
2. Select baud rate.
NOTE: See "RS485 2-Wire Communications Daisy-chain
Parameters" table for baud rate information.
3. Select Modbus Address (MB Addr) to pass through to the
RS485 serial port.
RS232 Pass-through to RS485 Ports
Pass-through mode from RS232 to RS485 passes Modbus RTU or Modbus ASCII messages out
to the serial port. The pass-through device (Powerlink G4 Controller) will pass through all Modbus
RTU or Modbus ASCII requests that are not the controller's serial ID or device ID. All requests
that are passed through are converted to Modbus RTU packets and transmitted out the RS485
serial port.
NOTE: The RS232 and the RS485 ports must both be configured for Modbus RTU or Modbus
ASCII.
From the Serial Comms setup screen, follow the steps in the "RS232 Pass-through to RS485
Serial Ports" table to setup pass-through mode from RS232 to RS485 ports.
Table 2: RS232 Pass-through to RS485 Serial Ports
Pass-through
Mode
RS232 to RS485
2
Screen Example
Pass-through Mode Setup Steps
1. Select "GATEWAY to 485" under 232 Mode.
2. Select RS232 baud rate.
NOTE: See "RS232 2-Wire Communications Parameters"
table for baud rate information.
3. Select Modbus Address (MB Addr) to pass through to the
RS232 serial port.
NOTE: The Modbus Address will automatically update for
RS485 when RS232 Modbus Address is assigned.
4. Select "GATEWAY frm 232" under 485 mode to pass
communications to RS485 from RS232.
5. Select RS485 baud rate.
NOTE: RS232 to RS485 is a one-to-one communication,
so it cannot be daisy-chained.
© 2014 Schneider Electric. All Rights Reserved.
1210DB1402
06/2014
Using Powerlink® G4 Controllers in Pass-Through Mode
Data Bulletin
ERROR MESSAGES
Table 3: Error Messages
Error Message
Causes
RS485 Gateway Mode and RS232 Gateway When RS232 mode is set to "GATEWAY to 485",
RS485 mode must be set to "GATEWAY frm 232"
Mode must both be enabled
to create a pass-through to receive
communications from RS232.
HARDWARE
Table 4: Hardware Specifications
Baud Rates Supported
4800, 9600, 19200, 38400, 76800, 115200
Serial Connection
RS232 - 2 wire, RS485 - 2 wire
Biasing
10k ohms
Termination
none
Isolation
none
RS232 2-WIRE COMMUNICATIONS PARAMETERS
Table 5: RS232 2-WIRE Communications Parameters
Baud Rate
Distance
4800, 9600, 19200, 38400, 76800, 115200
50 ft. (15 m)
RS485 2-WIRE COMMUNICATIONS DAISY CHAIN PARAMETERS
Use Belden® Cable 8723 CN2P22 Shielded E108998 or equivalent.
Table 6: RS485 2-WIRE Communications Daisy Chain Parameters
Baud Rate
Distance (1-8 Devices)
Serial Communications Time-out
4800
10,000 ft. (3048 m)
2 seconds minimum
9600
8,000 ft. (24408 m)
1 seconds minimum
19200
4,000 ft. (1220 m)
1 seconds minimum
38400
2,000 ft. (610 m)
1 seconds minimum
76800
2,000 ft. (610 m)
1 seconds minimum
115200
2,000 ft. (610 m)
1 seconds minimum
© 2014 Schneider Electric. All Rights Reserved.
3
Using Powerlink® G4 Controllers in Pass-Through Mode
Instruction Bulletin
CUSTOMER SUPPORT AND SERVICE
Contact the Customer Information Center for technical support by phone at 1 (888) 778 2733 or 1 (615) 287 3331.
E-mail at lightingcontrol.support@us.schneider electric.com.
Technical Support Center Hours: 7:30 AM to 5:00 PM CST
Contact your local Schneider Electric service representative for repairs or service to your network.
You may also find helpful information on our web site at www.Schneider Electric.us or our mobile website at
mysecontrols.com.
Schneider Electric, USA
320 Tech Park Drive, Suite 100
La Vergne, TN, 37086
1-888-778-2733
www.schneider-electric.us
All trademarks are owned by Schneider Electric Industries SAS or its
affiliated companies.
Electrical equipment should be installed, operated, serviced, and maintained
only by qualified personnel. No responsibility is assumed by Schneider
Electric for any consequences arising out of the use of this material.
© 2014 Schneider Electric. All Rights Reserved.
1210DB1402
06/2014
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