Instrutech Hornet User Manual page 15

Instruction Manual
3.2.2.2 RS485 COM / Relay Connector pin-out
CAUTION! Do not connect power to both the Analog and the RS485 connectors. Apply power only to one
or the other. Applying power to both connectors may cause damage to the gauge and other connected devices.
When using the RS485 serial communications mode of operation, use the 9-pin D-sub female (DE-9S) RS485
COM connector as described below. The same connector is also used for ion gauge setpoint relay connections.
PIN NUMBER
1
2
3
4
5
6
7
8
9
Setpoint Relay -N.O. 1
Power Input 2
No Connection 3
Power Ground 4
Setpoint Relay -N.C. 5
Note - The RS485 version of MKS Instruments / Granville-Phillips® Series 354 Micro-Ion® is provided with a 9-pin
male connector. The InstruTech's RS485 connector is a 9-pin female connector. If you are replacing an RS485
version of Micro-Ion® and would like to use your existing cable, a 9-pin use a female to male gender changer.
NOTICE
If you are using the InstruTech's PS501-A power supply and using the RS485 function do not
connect power to pins 2 and 4 of the RS485 COM connector. The will be received via the ANALOG connector.
Use the RS485 COM connector pins for communications and setpoint relay only. If you intend to operate the
IGM401 via RS485 communications only, power may be connected to pins 2 and 4 of the RS485 COM
connector but not the analog connector at the same time. Pin-out assignments are not the same, especially
for the +24 Vdc power and ground (power return) connections for the Analog and RS-485 COM connectors.
InstruTech, Inc.
RS485 COM / Relay 9-Pin D-sub (DE-9S) female Connector
PIN DESCRIPTION
Setpoint relay - Normally Open; referred to as RLY
Power Input (20-28 Vdc at 30 W). Do not connect power to both the Analog
and the RS485 connectors. Apply power only to one or the other.
No connection
Power ground (Also when using RS485 serial communications, connect this
pin to ground pin of your RS485 converter)
Setpoint relay - Normally Closed (RLY
RS485 DATA A (-) Input/output
Setpoint Relay - Common (RLY
Not used (do not connect)
RS485 DATA B (+) Input/output
6 RS-485 Input
1
6
DATA A (-)
7 Setpoint Relay
COMMON
9
5
8 No Connection
9 RS485 Input
DATA B (+)
RS485 COM / Relay 9-Pin D-sub female (DE-9S) connector
I
on front panel display
I
on front panel display)
I
on front panel display)
IGM401 Hornet
Page 13