Contents
MetPak RG User Manual
©
Gill Instruments Ltd
Last Change
Page 12
12 February, 2013
Digital Output RS485S 2 Wire Point to Point Connections
(COMMS set for RS485P2W)
This is not the default communications setting; ensure the MetPak RG has been
configured for this output requirement before wiring to a user device.
Note that it is not possible to network other devices on this 2-wire RS485
link.
J5 Hub Box
8 Way Push fit Block
RS485 to RS232
or USB Converter
Signal Names
Terminal
Nos.
2 Pair Cable
Signal Names
RS485 TX +
RS485 RX+
6
5
RS485TX/RX+
RS485 TX –
RS485 RX –
3
4
RS485TX/RX–
Signal 0v
2
Signal Ground
Chassis
Ground
Terminal
Post
Screen wires
Chassis ground
Power 0v
Power +ve
7
8
–
+
DC Power
Supply
Figure 8
RS485 Connections
Digital Output SDI-12 Connections (COMMS set for SDI12)
This is not the default communications setting; ensure the MetPak RG has been
configured for this output requirement before wiring to a user device.
Figure 9
SDI-12 connections
J5 Hub Box
8 Way Push fit Block
SDI-12 Device
Signal
Names
Terminal
Nos.
2 Pair Cable
Signal Names
SDI-12
1
SDI-12
Signal Ground
2
Signal Ground
Chassis
Ground
Terminal
Post
Screen wires
Chassis Ground
V Supply –
V
7
8
–
+
DC Power
Supply
