Comtech EF Data C5 - Manual (Page 257)

C5/K1/K3 Integrated Satellite Terminal System Options
Rev. 0 A–13
A.2.1.3.8 Non-ASYNC Operation
The ASYNC interface has pass-through capability. If ASYNC is turned off in the
Configuration Interface menu, then a standard EIA-422, or V.35 interface is selected. The
modem will operate as a standard, EIA-422, or V.35 interface with no overhead. Instead
of changing jumpers on the interface PCB to change polarities for various signals,
polarity inversion is available in the Utility Interface menu for the following signals:
! Data Mode (DM)
! Monitor and Control (MC)
! Receive Data (RD)
! Receive Timing (RT)
! Receiver Ready (RR)
! Request to Send (RS)
! Send Data (SD)
! Send Timing (ST)
! Terminal Timing (TT)
A.2.1.3.9 ASYNC Channel EIA-485 Operation
The ASYNC interface is compatible with a 2- wire interface for the EIA-485 channel.
The 2-wire operation is selected via the front panel. In the 2-wire mode, the EIA-485
receivers are disabled whenever the data is to be transmitted down the 2-wire interface.
A.2.1.3.10 Valid ASYNC Baud Rates
The ASYNC baud rates are limited by the terrestrial data rates. The following table
shows the relationships between data and baud rates.
If DR
& 15.999K
Maximum baud rate is 150
If DR
& 31.999K Maximum baud rate is 300
If DR
& 63.999K
Maximum baud rate is 600
If DR
& 127.999K Maximum baud rate is 1200
If DR
& 255.999K Maximum baud rate is 2400
If DR
& 511.999K
Maximum baud rate is 4800
If DR
& 1023.999K Maximum baud rate is 9600
If DR
& 2047.999K Maximum baud rate is 19200
If DR
& 2048.999K
Maximum baud rate is 38400