Single Gas Sensor Module (SGSM)
Operations Manual
Super Systems Inc.
Page 5 of 30
Page 5 of 51
Connections Diagram
The following diagram shows the connections for the SGSM. Connections will be identical for all
four models (A20831-CO
2
, A20831-CO
2
H, A20831-CO, and A20831-CH
4
)
Figure 1: Electrical & communications diagram for SGSM
Connection Ports & Function
HMI: This is the connection for an HMI.
RS485 #1: This is a communications port used for when this device is the Client.
RS485 #2: This is a communications port used for when this device is the Host to another
device.
10-30 VDC: This is the port to supply power to the SGSM.
Host: This is the USB Host port.
Device: This is the USB Client port.
Ethernet: This is the Ethernet port.
Configuration: This is where dip switch settings can be changed for the Modbus
communications address.
Analog Output: These ports are for analog output #1 and #2.