Yaskawa Remote Serial Communication Controller LAN Node PCB for use with Microtrac DSD LAN - Manual (Page 3)

INTRODUCTION
The Remote Serial Communications
Controller LAN Node PCB (RSC) allows
communication between an external device with
an RS-232 serial port and products on the
MicroTrac DSD LAN.
The RSC has a single RS-232 port for
communication to an external device with a
serial port (e.g. IBM PC, terminal, etc.).
The RSC communicates to MicroTrac
DSD products through an ARCNET LAN using a
proprietary message protocol defined by
MagneTek. This protocol allows messages to be
sent to and from the RSC in order to pass
display, numeric, and logic information (e.g.
Armature Current, Line Speed, Run, etc.).
This document explains the hard-ware
and software operations of the Remote Serial
Communications Controller LAN Node PCB
(RSC).
In the text, hexadecimal numbers will
have a prefix of 0 and a suffix of the letter H. For
example, the hexadecimal number representing
the decimal number 43 would be 02BH.
Furthermore, the terms "most significant byte"
and "least dignificant byte" are abbreviated as
"msb" and "lsb", respectively.
HARDWARE DESCRIPTION
POWER REQUIREMENTS
The power connector on the RSC is used
to supply the RSC with power. To select a
properly sized power supply, the current (I)
requirements of the RSC for each of the
voltages must be known. The I requirements
are as follows:
I for +5 VDC = 1250 mA
I for +15 VDC = 0 mA
I for -15 VDC = 270 mA
I for +24 VDC = 0 mA
LAN INTERCONNECT
There are 2 connections to be made in
order to connect the RSC to the LAN.
The first connector, J6 (faston tab), is to
be connected to chassis ground. This is
necessary in order to provide a return path for
the snubber network of the LAN.
The other connector, J2, is a BNC
connector to be connected to the ARCNET LAN
coaxial cable.
The RSC uses a High Impedence
Transceiver (HIT) for signal transceiving in order
to utilize a bus topology on the LAN.
In order to meet LAN requirements, type
RG-62/U coaxial cable must be used.
NOTE
For a full discussion of the LAN,
refer to the MicroTrac DSD
technical manual, TM 6100.
LAN NODE ADDRESS SWITCHES
The LAN Node address switches allow
for the selection of the network ID. The RSC
may have a Node address from 100 to 199.
Since the Node address is in the hundreds
range, the 1 in the hundred’s place is assumed,
and silk-screened on the PCB as a reminder.
There is a rotary switch for each of the other two
numeric positions, ten’s place (S1) and one’s
place (S2). These switches must be set before
power up, and remain set while powered up, for
proper operation. If the switches are changed
while powered up, then the LAN Node will get a
new network ID; however, the software will not
(and cannot) be made aware of the ID change,
thus invalid operation will occur.
RS-232 SERIAL PORT CONNECTION
The RSC communicates with an external
device through use of an RS-232 serial port.
The RSC is set up as a Data Carrier Equipment
(DCE). A 9-pin, D-type female connector (J4) is
provided on the RSC to allow cable connections
to the serial port. The function of each of the
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RD 790-30