Comtech EF Data MBT-5000 - Manual (Page 105)

MBT-5000 L-Band Up/Down Converter System MN-MBT5000
Serial-based Remote Product Management Revision 4
7–3
• Controller-to-Target pair has one line driver (Controller), and all Targets have line-receivers.
• Target-to-Controller pair has one line receiver (Controller), and all Targets have tri-state drivers.
7.1.2 EIA-232
This is a much simpler configuration in which the Controller device is connected directly to the Target via a two-wire-plus-ground
connection. Controller-to-Target data is carried, via EIA-232 electrical levels, on one conductor, and Target-to-Controller data is carried
in the other direction on the other conductor.
7.2 Remote Commands and Queries Overview
7.2.1 Basic Protocol
Whether in EIA-232 or EIA-485 mode, all data is transmitted as asynchronous serial characters, suitable for transmission and reception
by a UART. The asynchronous character format is 8-N-1 (8 data bits, no parity, one stop bit).
The supported baud rates are 2400, 4800, 9600, 19200, and 38400 baud.
All data is transmitted in framed packets as asynchronous serial characters, suitable for transmission and reception to the Controller using a
universal asynchronous receiver/transmitter (UART). Controller-to-Target data is carried via EIA-232 electrical levels on one conductor, and
Target-to-Controller data is carried in the other direction on the other conductor:
• Controller-to-Target: The Controller device (e.g., the user PC/CLI) is used to transmit instructions (commands) to – or to request
information from (queries) – the Target device (i.e., the MBT-5000).
• Target-to-Controller: The Target, in return, only transmits response information to the Controller when specifically directed by the
Controller.
For Serial Remote Control, all issued commands (Controller-to-Target) require a response (Target-to-Controller). This response is either
to return data that has been queried by the Controller, or to confirm the Target’s receipt of a command to change the Target’s
configuration.