Another option available on the 232D4SS8 is the slave ports set up as
Smart Switch Operation
The 232D4SS8 has two modes in which it can select ports, smart switch, and smart switch/port combiner.
Smart Switch Mode
Position 6 of SW1 must be in the off position to enable this mode. Refer to Figure 2 and Table 1. The Smart Switch is a listen only device. It constantly monitors the serial data received on the Master port for a command control string. A command can switch on or switch off any desired port. The command control string can be configured as a
Three Character Command String
The first character is user defined by setting SW2, an eight- position DIP switch. SW2 is programmed at the factory to the ASCII character STX (decimal 2). The second character represents the hexadecimal address of the Smart Switch where the desired port is located. The address for the 232D4SS8 is always zero (0). The third character is the ASCII upper case letter that represents the desired port. Letters "A", "B", "C", "D", "E", "F", "G" or "H" (decimal 65, 66, 67, 68, 69, 70, 71, or 72 respectively) are used to select ports on the 232D4SS8.
Example 1: To turn on port E of the 232D4SS8 (address zero) with ASCII STX (2 decimal) character set as the user defined character.
Send to the Master Port: STX 0 E
(2 48 69 decimal)
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. It is recommended that the selected port be turned off before selecting the next port. For this reason, if port A is currently selected and a command is sent to select port E, the command characters (STX 0
E)will pass through to the port A device and because characters "0" and "E" are printable they may appear on that device.
Documentation Number 232D4SS84502 Manual | 13 |
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph
