Jenn-Air 1300, 1892 manual Hardware Specification, RS232 Port Parameters

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5HARDWARE SPECIFICATION

5.1Introduction

The hardware of the modem part of the system is based on the FX929B modem chip from Consumer Microcircuits Ltd (CML). The radio part of the system can be either the G-MAX "rugged" transceiver, or the lower power SXn50 range of transceivers. The interface between the outside world and modem chip is controlled by a microprocessor.

The two types of transceiver are separate modules which is mounted onto the modem PCB.

The Hermes is supplied in 2 different mechanical versions. One of these uses a rugged enclosure suitable for wall mounting. The second version is housed in a 3U high “euro” cassette for mounting in a standard 19" rack.

5.2RS232 Port Parameters

The communication with the host processor is via a standard RS232 port. The data levels are as per the RS232 specification with logic '0' being a positive voltage.

The programmable parameters for the transmit and receive ports are:

Baud rates	4800/9600/19200/38400
Data bits	8 (note that 7data bits plus parity = 8 data bits with no
	parity)
Parity	Odd, Even or None
Stop bits	Receiver output = 1
	Input to transmitter = 1 or more

Hermes Operator Note

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Contents Lattice House Baughurst Basingstoke UK RG26 5LP Specialist RF DesignsTel +44 0 118 981 Fax +44 0 118 981 Received Signal Strength Indication Rssi AT S156 Table Of ContentsHandshaking Operation During Transmit and Receive List of Figures List of TablesIntroduction Connections & Indications RS232 ConnectorPin No Function RF Connector Power ConnectorFront Panel Indications Modem Operation IntroductionRS232 Data Handling Data Transfer ModesReceive-to-Transmit Turnround Description Time msMAX Command Mode List of CommandsOkcrlf Command Syntax ErrorcrlfBaud Rate AT B0 Parity ATB1Format Mode AT F AT F?CRLFOK Crlf Engineering Test Modes ATRXX, Dxxxcrlf Command Mode Guard Time AT S154 Software Version Information ATATI9CRLF Centre Radio Frequency AT S155Rssi Level Level at RF Input dBm ±2dB Radio Channel AT S157 Data Quality AT S158Squelch AT S159 Squelch Level Level at RF InputTransmission Power AT S160 Output Power for 1W G-MAX Output Power for 2W G-MAXPower Level Output Power DBm Tolerance Nominal Level NominalChannel Step Size AT S161 Test Message Period AT S162Over-Air Symbol Rate AT S163 Note engineering function only Preamble Period AT S165 Note engineering function onlyInvert Symbol AT S167 Frame Synch Tolerance AT S166 Note engineering function onlySquelch Delay AT S168 Restore defaults AT &Y8 Radio Frequency AT &FSave parameters AT &W AT &WCRLFDisplay parameters ATT? ATT?CRLFDo not enter unless you wish to carry out a code load Ppppppppppppppppppppppppppppppppppppppppppppppppppppp Hardware Specification RS232 Port ParametersRadio Specifications Parameter Max SXn50Mechanical Specification EnclosuresFront View of Casting Vibration Specifications Operating conditionsType Approvals EMC