B&B Electronics 3PCISD4B, 3PCISD4A manual RS-232 Mode, RS-422 Mode, RS-485 Mode

RS-232 Mode

To configure Port 1 for RS-232 mode, 5 jumpers must be checked. The following settings will configure Port 1 as RS-232.

1.Set the four jumpers of JP1 to the "232" (left) position.

2.Set the first jumper of JP3 (A) to the "232" (left) position.

The remaining jumpers of JP3 are unused in the RS-232 mode and may be in either position.

Table 7: RS-232 Pinouts

RS-232 Signal	Description	Direction	DB9M Pin
DCD	Data Carrier Detect	input	1
RD	Receive Data	input	2
TD	Transmit Data	output	3
DTR	Data Terminal Ready	output	4
GND	Signal Ground	----	5
DSR	Data Set Ready	input	6
RTS	Request to Send	output	7
CTS	Clear to Send	input	8
RI	Ring Indicator	Input	9

RS-422 Mode

Nine jumpers must be set/checked to configure each Port to the RS-422 mode. To set Port 1 for RS-422, set as follows below:

1.Set the four jumpers on JP1 to the "422" (right) position.

2.Set the top jumper of JP3 (A) to the "422/485" (right) position.

3.Set the second and third jumpers of JP3 (B) & (C) to the "422" (right) position. (These constantly enable receive & transmit.)

4.The fourth jumper JP3 (C) is unused in the RS-422 mode. (Selects RTS/SD for 485 mode)

5.	The bottom jumper of JP3 (E) switches the 120Ω receiver
	termination resistor IN or OUT. Typically this resistor is not used.
	In some cases using high baud rates and very long cables,
	termination is needed. See our RS-422/485 Application Note.
6.	Configure each port as above using the table in Appendix B.
Documentation Number 3PCISD4x-3903 Manual		Chapter 2	7

RS-422/RS-485 Pinouts

The RS-422 mode supports 2 channels (transmit and receive).

Table 8: RS-422/RS-485 Pinouts

RS-422	Description	Direction	DB9M
Signal			Pinout
--		--	1
RD(A) −	Receive Data A	input	2
TD(A) −	Transmit Data A	output	3
--		--	4
GND	Signal Ground	----	5
--		--	6
TD(B) +	Transmit Data B	output	7
RD(B) +	Receive Data B	input	8
--		NA	9

With 2-wire RS-485 mode operation, your connection cable must jumper RD(A) to TD(A) and RD(B) to TD(B). Connect from TD(A) & TD(B) to the Data A(−) and Data B(+) wires of your RS-485 network.

The EIA RS-422 Specification labels data lines with an "A" and "B" designator. Some RS-422 equipment uses a "−" and "+" designator. In almost all cases, the "A" line is the equivalent of the "−" line and the "B" line is the equivalent of the "+" line. More information on RS-422 communications can be found in our free RS- 422/485 Application Note (available on our websites).

RS-485 Mode

For a 4-wire RS-485 single master system, the card can be set as in the RS-422 mode (full duplex, transmit & receive enabled).

Nine jumpers must be set/checked to configure each Port to the RS-

485 mode. To set Port 1 for RS-485, set as follows below:

1.Set the four jumpers on JP1 to the "422" (right) position.

2.Set the top jumper of JP3 (A) to the "422/485" (right) position.

3.For 2-wire mode, set the second jumper, JP3(B) to the "485" (left) position (half duplex). For 4-wire mode, set it to the "422" (right) position (full duplex, receive enabled).

4.Set the third jumper, JP3 (C) to the "485" (left) position.

8 Chapter 2 Documentation Number 3PCISD4x-3903 Manual

B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104	B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445	B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445