Toshiba G3 Workbook page 20

Put Jumper 3 in the "TERM" position for the drives that are at the "ends" of the RS485 chain (i.e. only
one wire is connected to their S1 terminals and only one wire is connected to their S2 terminals).Put
all other drives' Jumper 3 in the "OPEN" position. The "TERM" connection puts a 120 ohm resistor
across S1-S2.
** Baud rate is affected by Jumpers 1 and 2 and the setting of RS485 Baud Rate (in the
COMMUNICATION SETTING PARAMETERS group) as follows:
J1
off
on
off
on
The maximum baud rate on the INV3-COM-B card is 19200.
The maximum baud rate on the INV3-COM-C card is 38400.
Adjust jumpers appropriately so that all drives have same baud rate.
Each slave may be separately trimmed up or down from the master reference by a local speed pot; see
Application Guideline 11, Trim Pot.
Slaves are still stopped/started via keypad or contact closure on the terminal strip.
Maximum combined cable length for RS485 is 1000 meters.
You must have a version 120 CPU to operate Master-Follower. Check CPU Version in the UTILITY
PARAMETERS group to verify (the other version is 101). If you do not have a version 120 CPU,
contact inverter marketing and request an option ROM for your version of CPU.
For additional assistance, please contact Toshiba Adjustable Speed Drive Marketing Dept. at (800) 872-
RS 485 Baud Rate
J2 0
off 9600
off 4800
on 2400
on 1200
2192
Setting
1
38400
19200
9600
4800
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