MKS P9B, Instruction Manual, Page: 55 / 112

Digital Interface Input and Output Options Chapter Four: Analog and Digital Interface
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For RS485 the baud rate and MAC ID (node address) switches are the
only
way to configure an RS485 MFC.
Baud Rate Switch
For RS485: The 3-position rotary switch is used to select the RS485 baud rate. The choices are: 9.6, 19.2,
and 38.4 Kb.
Factory default is 38.4 Kb.
The switch positions are numbered in a clockwise direction, to correspond to the increasing address values.
Figure 15: RS485 Baud Rate Switch
MAC ID (Node Address) Switches
Two 10-position rotary switches, shown below, are used to set the MAC ID (node address).
Figure 16: RS485 MACID Switches
The MAC ID is an integer identification value assigned to each node on the RS485 network.
Unrecoverable Fault Condition
A hardware problem with the EEPROM, or a memory problem with the RAM are major unrecoverable faults.
This fault condition sets its exception status bit, and the LED illuminates solid red
Note
A major unrecoverable fault prevents operation because the device cannot communicate on the
network. Contact MKS Instruments, Inc. for assistance.