B&B Electronics High Speed Asynchronous to Synchronous Converter 2011 - Manual (Page 6)

4 2011AS3297 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
3.2.1 CHARACTER LENGTH
Switches SW1-1 and SW1-2 operate jointly to set the asynchronous
character length. The asynchronous character length setting is determined
by combining the number of start, stop, data and parity bits that make up
each character generated by the asynchronous DTE. The Model 2011 does
not care about the composition of each asynchronous character, only its
length is significant. Below are the combined switch settings that set the
four possible asynchronous character lengths:
SW 1-1 SW 1-2
8 bit OFF ON
9 bit ON ON
10 bit OFF* OFF*
11 bit ON OFF
* Default settings
3.2.2 EXTENDED SIGNALING RATE (ESR)
The position of switch SW1-3 ensures that the asynchronous input
data rate matches the synchronous output data rate. When switch SW1-3 is
set to OFF, the asynchronous bit rate must match the synchronous clock
rate to a tolerance of -2.5% to +1%. When switch SW1-3 is set to ON, the
asynchronous bit rate must match the synchronous clock rate to a tolerance
of -2.5% to +2.3%.
SW 1-3
-2.5% to +1% OFF*
-2.5% to +2.3% ON
*Default settings
NOTE: Switch SW1-4 is not used.