Black Box IC476A-F-R2 - Manual (Page 12)

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CHAPTER 3: Configuration
3.2.1 DIP-S
WITCH
S
ETTINGS
The factory-default settings for the switches are presented below. Read the
information following the table for an explanation of the switch’s function.
Switch S1 Summary Table
Position Function Factory Default
S1-1* “Transmit Off” Impedance Off High Z
S1-2* “Transmit Off” Impedance Off
S1-3 RTS/CTS Delay On 8 msec.
S1-4 Echo Mode Off Echo Off
S1-5 Carrier Control On Controlled by RTS
S1-6 Receive Impedance On 120 ohm
S1-7* 2 wire/4 wire On 2-wire
S1-8* 2 wire/4 wire On
*Note: Switches S1-1 and S1-2 should be switched simultaneously.
Switches S1-7 and S1-8 should also be switched simultaneously.
S1-1 and S1-2: “Transmit Off” Impedance
Switches S1-1 and S1-2 are set together to determine whether the receiving
device “sees” the impedance of the Converter’s transmitter as being “high”
or “intermediate” when the transmitter is turned off. The “intermediate”
setting is useful in half-duplex environments where the receiving device
does not respond well to the “high” setting.
S1-1 S1-2 Setting
On On Intermediate Impedance
Off Off High Impedance
S1-3: RTS/CTS Delay
The setting for switch S1-3 determines the amount of delay between the
time the Converter “sees” RTS and when it sends CTS. Note: RTS/CTS
Delay setting should be based upon transmission timing.
S1-3 Setting
On 8 msec.
Off No delay