Emerson MRLDS - Manual (Page 13)

MRLDS Gateway MRLDS Modbus Version (809-101x) • 7
bits with no parity and 2 (two) stop bits.
4.3 MRLDS Gateway
4.3.1 MRLDS Gateway Setup on
I/O Network
Modbus versions of the MRLDS must be connected to
the 810-3040 MRLDS Gateway. The MRLDS Gateway
can be mapped in either of two ways: it can be set up on
I/O Net as an IRLDS application or as a 16AI board.
Select by setting the Gateway’s dip switch #5 to the OFF
or ON position (Figure 4-6).
4.3.2 Gateway Connections
Up to 12 MRLDS units may be connected to the Gate-
way board (P/N 810-3040). The Gateway board can inter-
face with a site controller as a 16AI or as an IRLDS. If the
site controller is an Einstein or E2, it is recommended to
interface them as an IRLDS. Multiple Gateways can be
used, each with up to 12 connected MRLDS units.
4.3.3 The Gateway Board
Register
Name
PDU
Address
Logical
Address
Range
Fault and
Module
State
0x0000 1 Under Range
2 (msb)
Under Volt-
age 8 (msb)
Temperature
10 (msb)
Lamp Fail
40 (msb)
Test Mode
80 (msb)
Warm Up
Complete
0 (Lsb)
Cal/Setup
2 (Lsb)
Factory
Mode
4 (Lsb)
Trouble
Mode
8 (Lsb)
Gas
Number
0x0001 2 0 to 40
Gas Con-
centration
0x0002 3 -20 to 1050
(ppm)
Gas
Numbers
R-22 = 6
R-404A = 27
R-134a = 15
Table 4-3 - RS485 Output Specifications
Figure 4-6 - I/O Network Modes
Figure 4-7 - MRLDS Gateway Board Layout (810-3040)
SELECT I/O NET MODE
OFF = IRLDS
ON = 16AI
ON = 16AI OFF = IRLDS
ON