Option b switches, Baud switches – CTI Products NCB/AY with Serial Interface User Manual
Page 16
CTI Products, Inc.
NCB-AY User Guide
2. Setup and Operation
10
If OPTION A Switch 5 is DOWN, dynamic determination of the domain/subnet/node number by a
Network Management Tool is allowed.
OPTION B Switches
OPTION B switches set the Serial Port Handshaking options.
1. PORT 1 CTS sense..........................Disabled
Enabled (Normal)
2. PORT 1 DSR sense .........................Disabled
Enabled (Normal)
3. PORT 2 CTS sense..........................Disabled
Enabled (Normal)
4. PORT 2 DSR sense .........................Disabled
Enabled (Normal)
DOWN
UP
1
2
3
4
ON
CTS/RTS flow control can be used to pace the transmission of individual bytes between the NCB and a
connected device.
DSR/DTR handshaking informs the NCB that a connected device is active. If the channel does not directly
support DSR/DTR handshaking, DSR must be strapped back to the (always active) DTR output signal.
When enabled, the operation of CTS/RTS and DSR/DTR is as follows:
Signal
Direction
Function
CTS
Input to NCB
Active when the connected device is ready to accept characters from NCB.
This signal is driven by the RTS signal of the connected device.
RTS
Output from
NCB
Active when NCB is ready to accept characters from the connected device.
This signal is received by the CTS signal of the connected device.
DSR
Input to NCB
Active when a connected device is functioning.
This signal is driven by the DTR signal of the connected device.
If driven inactive, NCB front panel “ERR” LED will flash quickly, and NCB
will not communicate with this device.
If DSR signal is not available from connected device, strap to DTR output.
DTR
Output from
NCB
Always driven active by NCB.
BAUD Switches
“BAUD 1” and “BAUD 2” switches correspond to “PORT 1” and “PORT 2” connectors and allow either
disabling the port for use or enabling it at a specific baud rate.
Position
Function/Baud Rate
0
Disable Port
1
1200 Baud
2
2400
3
4800
4
9600
5
19200
6
38400
7
57600
8
115200
8 9
7
A
B
C
D
E
F
0
1
2
3
4
5
6
8 9
7
A
B
C
D
E
F
0
1
2
3
4
5
6
BAUD 1
BAUD 2