B&B Electronics 3PCIOSD1x-3903m RS-232 Mode, RS-422 Mode, Name Description Direction DB25M Pin

RS-232 Mode

To configure the port for RS-232 mode, 5 jumpers must be set/checked. The following settings will configure the port as RS- 232:

1.Set four jumpers of JP2 (A-D) to the "232" (left) position.

2.Set JP1 to the "RTS(232)" (right) position.

The remaining jumpers, JP4, are unused in the RS-232 mode and may be in either position. Figure 2 shows the jumper configuration to set the port for RS-232 mode with *1 clock enabled.

	JP2	422/ 485		JP1
A 232			CONTROL
B 232		422/ 485	SD		RTS(232)
C232		422/ 485
D232		422/ 485

	MODES
TX 422	485		JP3
RX 422	485 JP4
I N	OUT	*4	*1
TERMI NATI ON			CLOCK

Figure 2. RS-232 Mode Jumper Settings

RS-232 Pinouts

The DB-25 male connector on the 3PCIOSD1x cards is configured as standard DTE RS-232 serial port. Table 1 lists pin numbers and descriptors.

Name	Description	Direction	DB25M Pin
Shield	Shield	------	1
TD	Transmit Data	Output	2
RD	Receive Data	Input	3
RTS	Request to Send	Output	4
CTS	Clear to Send	Input	5
DSR	Data Set Ready	Input	6
GND	Signal Ground	------	7
DCD	Data Carrier Detect	Input	8
DTR	Data Terminal Ready	Output	20
	Table 1: RS-232 Pinouts
Documentation Number 3PCIOSD1x-3903m Manual			Chapter 2	7

RS-422 Mode

To configure the port for RS-422 mode, 7 jumpers must be set/checked. The following settings configure the port as RS-422:

1.Set the four jumpers of JP2 (A-D) to the "422/485" (right) position.

2.Set the top jumper "TX" of JP4 to the “422” (left) position.

3.Set the second jumper "RX" of JP4 to the “422” (left) position.

4.The JP1 Control (SD/RTS) jumper is unused in the RS-422 mode and may be in either position.

5.The bottom jumper "Termination" of JP4 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 B&B’s free RS-422/485 Application Note, Termination section, page 16, for more information (available on our websites). Figure 3 shows the jumper configuration to set the port for RS-422 mode with *1 clock enabled.

	JP2	422/ 485		JP1
A 232			CONTROL
B 232		422/ 485	SD		RTS(232)
C232		422/ 485
D232		422/ 485

	MODES
TX 422	485		JP3
RX 422	485 JP4
I N	OUT	*4	*1
TERMI NATI ON			CLOCK

Figure 3. RS-422 Mode Jumper Settings

8 Chapter 2 Documentation Number 3PCIOSD1x-3903m 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