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

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 Page 28 of 32