Remote-processing RPC-30 Manual de usuario Pagina 15
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CHAPTER 4 SERIAL PORTS
RPC-30 Page 13
Figure 4-2 Network diagram
Only one device on a RS-485 network should have a
terminator installed. The host transmitter should also
have a 100 ohm resistor in series with a 0.1 mfd
capacitor. T he term inator on the RPC -30 includes pu ll
up and pull down resistors to prevent lines from floating
and generating er roneous char acters.
MULTIDROP NETWORK
You can use the RPC-30 in a multidrop network by
using CO M2' s RS-422/ 485 port. You can connect up to
32 units (including other RPC-30' s) over a 4,000 foot
range.
Figure 4-2 shows an example of a multidrop network.
This network includes a host and one or m ore devices.
The host transmits data packets to all of the devices, or
nodes, in the network. A data packet includes an
address, com mand, data, and a checksum. See figure 4-
3. The packet is received by all devices, and ignored by
all except the one addressed.
The relationship described below between nodes and the
host is a master-slave. The host dir ects all
communication. Nodes "do not speak unless spoken to".
Peer to peer communication, while possible with the
RPC-30, is not discussed here. The problem is defining
a bus arbitration scheme, of which there are many.
There are m any communication protocols. F or this
example, a protocol might look som ething like this:
> 22MB1
The protocol starts w ith the < cr> character. This
character synchronizes all units and alerts them that the
next few characters coming down are address and data.
In this case, "> 22" is the units address. "M " is the
comm and and " B1" is the checksum . T he comm and is
terminated with a < cr> character.
- TRADEMARKS 1
- NOTICE TO USER 1
- TABLE OF CONTENTS 2
- CHAPTER 1 OVERVIEW 3
- OVERVIEW CHAPTER 1 4
- SETUP AND OPERATION CHAPTER 2 10
- CHAPTER 2 SETUP AND OPERATION 11
- SAVING PROGRAMS CHAPTER 3 12
- CHAPTER 3 SAVING PROGRAMS 13
- SERIAL PORTS CHAPTER 4 14
- CHAPTER 4 SERIAL PORTS 15
- RAM MEMORY CHAPTER 5 18
- CHAPTER 5 RAM MEMORY 19
- INTRODUCTION 22
- WARNING: 22
- ON-CARD OPTO RACK 22
- DIGITAL I/O PORT 23
- Page 24 RPC-30 26
- COMMANDS 27
- CALENDAR/CLOCK CHAPTER 7 28
- CHAPTER 8 DISPLAY PORT 29
- DISPLAY PORT CHAPTER 8 30
- CHAPTER 9 KEYPAD PORT 31
- KEYPAD PORT CHAPTER 9 32
- CHAPTER 10 SPEAKER 33
- WATCHDOG TIMER CHAPTER 11 34
- CHAPTER 12 USER JUMPERS 35
- SERIAL EEPROM CHAPTER 13 36
- TECHNICAL INFORMATION 37
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