Eurotherm/Barber-Colman Digital Communications Wiring Connections

Digital Communications Wiring
TIA/EIA-232, TIA/EIA-422 and TIA/EIA-485
(previously RS-232, RS-422 and RS-485 and used here)

If you wish to communicate to several instruments using 1 serial port in a multi-drop arrangement, then you need to use an an RS-232 to RS-422 or a RS-232 to RS-485 converter that can be an external or internal board in your computer.

For 5000 Series master communciations wiring to Eurotherm controllers click here.

RS-232 Wiring from a PC Serial Port to One (1) Eurotherm Controller or Chessell Recorder

EIA-232D Serial Port			800, 900, and Series 2000 and Chessell 100mm Video or Bargraph and 5000 Series The 2216e, 2208e, 2204e, 2416, 2408, 2404, 2604 and 2704 all support RS-232.
Signal Name	9 pin	25 pin	808/847 809/849	815/818	900EPC	2200e 2400 2604 2704	4103C/M 4100G 5100V 5180V 5000B	Signal Name
Rx	2	3	13	15	X1	HF	Tx	Tx
Tx	3	2	15	13	X3	HE	Rx	Rx
Signal Ground	5	7	11	17	X5	HD	0V	Signal Ground

RS-232 Wiring from a PC Serial Port into a Eurotherm Model 261 RS-232 to RS-422/485 Converter

EIA-232D Serial Port			Model 261
Signal Name	9 pin	25 pin	261	Signal Name
Rx	2	3	2	Tx
Tx	3	2	3	Rx
Signal Ground	5	7	7	Signal Ground

RS-422/RS-485 Wiring from a Eurotherm Model 261 to multiple Eurotherm Controllers and Chessell Recorders (Using 4 or 5 wire full duplex, RS-422/RS-485)

Model 261		94C, 800, 900 and Series 2000 and Chessell 100mm Video or Bargraph and 5000 Series The 2216e, 2208e, 2204e, 2416, 2408, 2404, 2604 and 2704 all optionally support RS-422.
Signal Name	261	94C	808/847 809/849	815/818	842	900EPC	2200e 2400 2604 2704	4103C/M 4100G 5100V 5180V 5000B	Signal Name
A' Rx+	3	11	12	15	5	X1	HE	Tx A	A Tx+
B' Rx-	16	12	13	16	6	X2	HF	Tx B	B Tx-
A Tx+	12	13	14	13	7	X3	HB	Rx A	A' Rx+
B Tx-	13	14	15	14	8	X4	HC	RX B	B' Rx-
Signal Ground	7	15	11	17	4	X5	HD	0V	Signal Ground

RS-232 Wiring from a PC Serial Port to a duTec BaudMaster Serial RS-232 to RS-485 Converter

RS-232 Serial Port			duTec
Signal Name	9 pin	25 pin	Dutec's 9 pin connector	Signal Name
Rx	2	3	3	Tx
Tx	3	2	2	Rx
Signal Ground	5	7	5	Signal Ground

RS-485 Wiring from a duTec BaudMaster to Eurotherm Controllers and Chessell Recorders (using 2 wire half duplex, RS-485)

Signal Name	Model: duTec	Eurotherm Model
	Line Side	2216e 2208e 2204e	2416 2408 2404	5100V 5180V	Signal Name
Rx B-		HE		Tx A/Rx A	A/A'
Tx A+		HF		Tx B/Rx B	B/B'

Note: For the 5100V/5180V Recorders above, note that the Tx A and Rx A terminals are jumpered and the Tx B and Rx B terminals are jumpered; typically at the rear terminals of the recorder.

RS-422 Wiring from a duTec BaudMaster™ to Eurotherm Controllers and Chessell Recorders (using 5 wire full duplex, RS-422)

DuTec RS-422 Output		94C, 800, 900, Series 2000 and Chessell 100mm Video or Bargraph and 5000 Series The 2216e, 2208e, 2204e, 2416, 2408, 2404, 2604 and 2704 all support RS-422.
Signal Name	Line Side	94C	808/847 809/849	815/818	842	900EPC	2200e 2400 2604 2704	4103C/M 4100G 5100V 5180V 5000B	Signal Name
	Rx B-	11	12	15	5	X1	HE	Tx A	A Tx+
	Rx A+	12	13	16	6	X2	HF	Tx B	B Tx-
	Tx B-	13	14	13	7	X3	HB	Rx A	A' Rx+
	Tx A+	14	15	14	8	X4	HC	Rx B	B' Rx-
	Signal Ground	15	11	17	4	X5	HD	0V	Signal Ground

RS-422 Wiring from a duTec BaudMaster™ to Eurotherm Recorders 4250 Series (using 5 wire full duplex RS-422)

DuTec RS-422 Output		Eurotherm Chesell 4250 Series
	Line Side	4250D, 4250G & 4250M	Signal Name
	Tx -B	2	RXA
	Tx +A	3	RXB
	Rx -B	8	TXA
	Rx +A	7	TXB
	Signal Ground	5	Signal Ground

Note that the Male DB-9 connector may be used for Modbus communications only. The Female DB-9 is used for XIODL.

RS-422 (4-wire) to RS-485 (2-wire) Wiring from a Eurotherm T800 to Series 2000 controllers using a duTec BaudMaster

T800 RS-422 Master Modbus Output (RJ45)		DuTec RS-422 Input	DuTec RS-485 Output		Series 2000
Signal Name	Pin #	Equipment Side	Line Side		Signal Name
Rx -	1 (wht/org)	Tx +A	TX (A)	Connect to	HF
Rx +	2 (org/wht)	Tx -B	RX (B)	Connect to	HE
Tx -	7 (wht/brn)	Rx +A
Tx +	8 (brn/wht)	Rx -B

RS-232 to RS-485 Series 7 Using an External B&B converter (Model 485SD9TB or equivalent)

Signal Name	Model: B&B 485SD9TB	Eurotherm Series 2000 and Series 7 Controllers/Indicators
		Series 2000	7SF, 7SC, 7SI, 7SL	7EF, 7HF, 7EC, 7ES	Signal Name
TD(A)		HE	11	11	A/A'
TD(B)		HF	12	10	B/B'
COM		HD	13	9	C

RS-422/RS-485 PC Internal Comms Converter Wiring

Eurotherm has tested the following board from Sealevel. This board provides 2 ports internally in your computer which can be configured for RS-422/RS-485. First set the J1 or J2 jumper on the printed circuit board. Then, the ports are wired as follows for 5 wire RS422/RS-485:

Sealevel #3082		94C, 800, 900 and Series 2000 Instruments The 2216e, 2208e, 2204e, 2416, 2408, 2404, 2604 and 2704 all support RS-422.
Signal Name	Sealevel 9 Pin Connector	94C	808/847 809/849	815/818	842	900EPC	2200e 2400 2604 2704	Signal Name
RX-	2	11	12	15	5	X1	HE	A Tx+
RX+	1	12	13	16	6	X2	HF	B Tx-
TX-	3	13	14	13	7	X3	HB	A' Rx+
TX+	4	14	15	14	8	X4	HC	B' Rx-
Signal Ground	5	15	11	17	4	X5	HD	Signal Ground

A typical computer has 1 or 2 serial ports which are called COM1 or COM2, are RS-232 and they physically look like 9 pin or 25 pin male "D" connectors. Please note, if you have an internal modem configured as COM1 or COM2, that serial port will be disabled for other purposes. An RS-232 serial port can communicate to one (1) Eurotherm instrument only. If you wish to communicate to several instruments using 1 serial port, then you need to use an an RS-232 to RS-422 or a RS-232 to RS-485 converter that can be an external or internal board in your computer.

Before starting to wire a communications cable, please add the following soldered jumpers directly on your 9 pin or 25 pin connector that will be plugging into your standard RS-232 computer's serial port.

	9 pin female connector	25 pin female connector
Solder jumper # 1	pins 1, 4, and 6	pins 6, 8, and 20
Solder jumper # 2	pins 7 and 8	pins 4 and 5

For information on ordering the RS-232 to RS-422/RS-485 converters shown on this page, click here.

The above wiring connections are required for standard communications. The DB-9 pin assignments shown above are not valid for all computers. For assignments specific to other machines, refer to the owners manual or contact your local computer supply company. We strongly suggest that you test your wiring installation with a software program such as Eurotherm's Sampler program.

Last Updated Thursday, May 18, 2006