STP-iXA2205 Series Turbomolecular Pump
Nov. 10
92
Issue 1-h
5
SERIAL
COMMUNICATION
PROTOCOL
5.2.2 Connecting the RS485
Make sure the followings when using the serial port COM1 with RS485 or COM2.
A connection condition is 1 on 1 (single point connection) or 1 on N (multi-point connection).
A maximum number of 32 SIMs are connectable in the multi-point connection.
After receiving commands, SIM will return a response approximately 5 msec later
*1
. Use the PC of
which transmit/receive switch time is 5 msec or less.
Use twisted-pair wire in communication cable. The extended communication cables should be 1.2 km
or less.
Connect the terminator to the communication devises at both ends of the transmission line. The
terminator (120
ȍ
, 0.25 W) is required for connection.
(the STP-iXA2205 series dose not have terminator setting function)
PC
7 (D–)
8 (D+)
120
㱅
120
㱅
SIM
(connector X3
or X4)
a) RS485 single point connection
PC
7 (D–)
8 (D+)
120
㱅
7 (D–)
8 (D+)
120
㱅
7 (D–)
8 (D+)
SIM 1
(connector X3
or X4)
SIM 2
(connector X3
or X4)
SIM N
(connector X3
or X4)
b) RS485 multi-point connection
Figure 58 - RS485 connections
*1
Software version 63_A 1.2 or later.
