B&B Electronics manual Expansion Mode, Esc Stx C B, 232XS5 Expander Mode Commands

Expansion Mode

Expansion	Expansion	Expansion
Port	Port	Port

You could then send SWB$ to select port B of Expansion switch unit address “C”. Similar strings could be used for turning on the other ports. To turn off the ports the string might look like this:

Slave	Slave	Slave	Slave	Slave	Slave
Port	Port	Port	Port	Port	Port

Slave Slave

Port Port

TOFF$ = CHR$(27) + CHR$(2) + CHR$(4)

Master Port

E		D
	Address D C
A		B
Slave		Slave
Port		Port

E		D
	Address C C
A		B
Slave		Slave
Port		Port

E D

Address B C

A B

Slave Slave

Port Port

E		D	Slave
	Address A C
A		B	Port
Slave		Slave
Port		Port

When you are done with a port you can either select a new one directly or turn off the selected port and then turn on the next one. For information on preventing command codes from being received by slave devices, refer to the Enhanced Mode section.

17-Port Cascaded Expansion Mode

The number of serial ports on the 232XS5 can easily be expanded to a maximum of seventeen ports. Up to four 232XS5 units may be cascaded in expander mode. Each unit address adds four additional serial ports to the five on unit address “A”. Port C is used as the expansion port that connects to the follow-on master- port for switch units addressed “B” thru “D”. Expansion Switch unit address “A” is the last Switch in the chain.

Expander mode is selected when jumper “JP6-B” is OFF (removed.) In Expander mode, the 232XS5 is constantly looking for a four character preamble code by monitoring the data that is being received on the master port from the host device. The 232XS5 requires a four character preamble code to turn on and off a port. The first character must be the ASCII escape character (decimal 27). The second character is user programmable by setting dipswitch “SW2”. “SW2” comes from the factory programmed to the ASCII character STX (decimal 2). The third character is the Expansion Switch Unit Address character “A” through “D”. The fourth character should be the ASCII upper case letters "A", "B", "C", "D" or “E” (decimal 65, 66, 67, 68 or 69 respectively) to select those ports. To turn off the selected port the third character should be the ASCII EOT character (decimal 4). For instance, to turn on port B of Expansion Switch unit address C, you would send:

ESC STX C B

If you were writing a program in BASIC to control the Smart Switch you would form a string like this:

SWB$ = CHR$(27) + CHR$(2) + "C" + ”B”

232XS5-1005 Manual 13

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445

Table 9 - 232XS5 Expander Mode Commands

	Command Characters
Function	1st	2nd	3rd	4th	Comments
Select Port A	ESC	X*	“A”	“A”	Address A
Select Port B	ESC	X*	“A”	“B”	Address A
Select Port C	ESC	X*	“A”	“C”***	Address A
Select Port D	ESC	X*	“A”	“D”	Address A
Select Port E	ESC	X*	“A”	“E”	Address A
Select Port A	ESC	X*	“B”	“A”	Address B
Select Port B	ESC	X*	“B”	“B”	Address B
Select Port D	ESC	X*	“B”	“D”	Address B
Select Port E	ESC	X*	“B”	“E”	Address B
Select Port A	ESC	X*	“C”	“A”	Address C
Select Port B	ESC	X*	“C”	“B”	Address C
Select Port D	ESC	X*	“C”	“D”	Address C
Select Port E	ESC	X*	“C”	“E”	Address C
Select Port A	ESC	X*	“D”	“A”	Address D
Select Port B	ESC	X*	“D”	“B”	Address D
Select Port D	ESC	X*	“D”	“D”	Address D
Select Port E	ESC	X*	“D”	“E”	Address D
Deselect Port	ESC	X*	EOT	NU**	Switching Command
Set Timer Value	ESC	X*	“T”	“0”-”9”	Enhanced Mode
Set Timer Mode	ESC	X*	“M”	“0”,”1”	Enhanced Mode

*X represents the programmable character set by dipswitch SW2

**NU = Not Used

***Port C is used as the expansion port for unit addresses B thru D.

14 232XS5-1005 Manual

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445