16 • RLDS I&O Manual
026-1309 Rev 11
4
Connecting
Communication
Devices
4.1. E2 MODBUS Direct
Support for RLDS
4.1.1. Network Connection to E2
Connecting an RLDS to an E2 unit requires the E2
version 3.01 and above. Contact Emerson for upgrade
information if the controller is a version prior to 3.01.
4.1.1.1. COM Port Associations - E2
Versions 3.xx and Below
An E2 has up to three COM ports that can be
assigned for MODBUS communication (COM2, an
RS485 port on the E2 power interface board, and
COM4 and COM6, which are optional ports requiring
expansion cards). COM ports can only be used for one
function; in other words, if COM2 is set up as the I/O
network, you cannot connect MODBUS devices to
COM2. Ensure your E2 is equipped with an RS485
COM Card (P/N 637-4890) and configured in E2
General Services (
,
Serial
tab)
to
enable COM4 or an E2 Expansion COM Card
(P/N 637- 4871) to enable COM6.
Connect the MODBUS network cable to the
three-terminal connector on the COM port you wish
to assign as MODBUS. Wire RS485+ to the RLDS+
RS485- to the RLDS- and the shield cable to the
RLDS GND.
4.1.1.2. COM Port Associations - E2
Versions 4.0 and Above
An E2 has three COM ports that can be assigned for
MODBUS communication (COM2). COM ports can
only be used for one function; in other words, if
COM2 is set up as the I/O network, you cannot
connect MODBUS devices to COM2. Ensure your E2
is configured in E2 General Services (
,
Serial
tab)
to enable COM4 or COM6.
Figure 4-1
- Location of E2 COM Ports - E2 PIB Board (E2
version 3.xx and below)
E2 PIB COM PORT ASSOCIATIONS
COM1
COM4
COM6
COM2
Serial Device
RS485 COM Port
(2 Connectors)
RS485 COM Card
(2 Connectors)
Serial Device
RS232 Port
POWER INTERFACE BOARD
(PIB)
E2 Modem/Expansion
COM Card Mounted
Above PIB
Plug-In
Modem
Card
COM3
E2 Enclosure (Right Side)
RS485
RS232
Figure 4-2
- Location of E2 COM Ports - E2 PIB Board (E2
version 4.0 and above)
E2 PIB COM PORT ASSOCIATIONS
COM1
Serial Device
RS232 Port
POWER INTERFACE BOARD
(PIB)
E2 Enclosure (Right Side)
COM2
COM6
COM4
Serial Device
RS485 COM Ports
Plug-In
Modem
Card
COM3
Summary of Contents for GW-810-3760
Page 1: ...Refrigerant Leak Detection System RLDS Installation and Operation Manual 026 1309 Rev 11 ...
Page 37: ...30 RLDS I O Manual 026 1309 Rev 11 Figure 4 22 Connecting the Gateway to the RS485 Network ...
Page 84: ...Appendix B System Menu Map B 79 Appendix B System Menu Map ...