User`s guide

HN-2010

Modem Commands

The HopNet is configured and controlled through a series of commands. These

commands are sent to the modem directly when the modem is in Control Mode or

when the modem is in Data Mode if the escape sequence is enabled. The command

syntax is the same for either method, a one- or two-letter command followed by one

or more parameters. The modem will respond with a two-byte message that indicates

the new modem parameter value. The commands are loosely grouped into five

different categories: Serial commands, Network commands, Protocol commands,

Status commands and Memory commands. Each command is described in detail

below. In the descriptions, brackets ([,]) are used to denote a set of optional

arguments. Vertical slashes (|) separate selections. For example, given the string

wn[?|0..3f], some legal commands are wn?, wn0, wn3 and wna. Most commands

which set a parameter also have a ? option which causes the modem to respond with

the current parameter setting, e.g., wn? Each modem command must be followed by

either a carriage return or a line feed.

Serial Commands

These commands affect the serial interface between the modem and the host. The

default settings are 9600 bps and protocol mode 0.

Command Description

sd[?|00..FF] Set Data Rate Divisor

Data Rate Divisor (hex)

1200 bps = BF

2400 bps = 5F

9600 bps = 17

14400 bps = 0F

19200 bps = 0B

28800 bps = 07

38400 bps = 05

57600 bps = 03

115200 bps = 01

230400 bps = 00

sp[?|00..14] Set Protocol Mode

00 = point-to-point transparent mode

01 = basic command and data only

02 = command, data and connection notification

04 = WIT2400 protocol mode

05 – 08 = reserved for future use

09 = mode 01 during transmit, transparent receive

0C = mode 04 during transmit, transparent receive

0D – 10 = reserved for future use

11 = transparent transmit, mode 01 during receive

12 = transparent transmit, mode 02 during receive

14 = transparent transmit, mode 04 during receive