User's Manual
Table Of Contents
- Contents
- Tables
- Figures
- 0 Document History
- 1 Introduction
- 2 Product Concept
- 3 Interface Description
- 4 Electrical and Environmental Characteristics
- 5 Mechanics, Mounting and Packaging
- 6 Full Type Approval
- 7 List of Parts and Accessories
GWM400 Product Technical Specification and User Guide
3.4 Molex Microfit Connector
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GWM400_HID_v02 2017-07-05
Confidential / Prelimenary
Page 22 of 38
3.4.1 RS-232 Interface
The RS-232 interface is implemented as a serial asynchronous transmitter and receiver con-
forming to ITU-T V.24 Interchange Circuits DCE. Based on the conventions for DCE-DTE con-
nections it communicates with the host application (DTE) using the following signals:
• Port TxD @ application sends data to TXD0 of the GWM400
• Port RxD @ application receives data from RXD0 of the GWM400
The serial interface (also called ASC0) is configured for 8 data bits, no parity and 1 stop bit, and
is by default operated at a fixed baud rate of 9600bps, but can be configured for bit rates from
1200bps to 921kbps. Autobauding supports bit rates from 1.2kbps to 230kbps. Hardware hand-
shake using the RTS0 and CTS0 signals and XON/XOFF software flow control are supported.
In addition, the modem control signals DTR0 and DCD0 are available. There are different
modes of operation that can be set with AT commands.
3.4.2 Power Supply
The power supply of the GWM400 has to be a single voltage source of V
PLUS
=4.75V…32V ca-
pable of providing a peak current of about 368 mA at 15V during an active transmission. The
uplink burst causes strong ripple (drop) on the power lines. The absolute minimum voltage
during drops must be >4.75V.