Chapter 6. Configuration
61202.029L2-1 ISU 128 User Manual 45
Data Format (Asynchronous)A frame consists of a start bit, 7 or 8 data bits, 0 or 1 parity bit, and 1 to 2 stop
bits. The settings for Data Bits, Parity Bits, and Stop Bits are available as
shown in Figure 6-18.
Figure 6-18
Data Format Menu Tree
Transmit Clock (Synchronous Data Format)Selecting the Normal option causes the ISU 128 to be the synchronous DTE in-
terface transmit timing source. Transmit data is timed from the transmit clock
provided by the ISU 128 on the DTE connector. Normal clock is the normal
mode of operation for the ISU 128.
With the External option selected, the ISU 128 slaves to an external transmit
timing source. The external clock is provided to the ISU 128 by the external
transmit clock signal at the DTE connector. This signal is echoed by the ISU
128 to the transmit clock signal on the DTE connector.
This option provides for situations where equipment connected to the ISU 128
DTE connector cannot slave to the ISU 128 provided clock. The ISU 128 uses
the U-interface as the frequency standard when it must provide a synchronous
receive or transmit clock. The externally provided clock must be of the same
average frequency as the clock that the ISU 128 would provide if internal clock
were selected. If this is not the case, then bit errors may occur.
3=CONFIG
1=Netw. options
2=DTE options
3=Protocol
4=Quick setup
5=Remote config
1=Bit Rate
2=Connector Type
3=RTS Options
4=CTS Options
5=CD Options
6=DTR Options
7=DSR Options
8=Flow Control
9=Data Format
1=Asynchronous
2=Synchronous
1=Data Bits
2=Parity Bits
3=Stop Bits
1=8 Data Bits
2=7 Data Bits
1=1 Stop bit
2=1.5 Stop bits
3=2 Stop bits
1=None
2=Odd
3=Even