7ML19981DP02
External Modem Kit – INSTRUCTION MANUAL
Page 9
Configuring Instrument
RS-232 Modem Kit Instruments
EnviroRanger ERS 500, Accumass BW500, Accumass SF500,
AiRanger with SmartLinx® Modbus RTU card, OCM III
EnviroRanger ERS 500
Port 2 set-up parameters:
*(2) refers to the primary index (secondary index 0).
Wiring Diagram for Connection to EnviroRanger ERS 500 (Rack and Panel Mount)
1.
Use an ohmmeter to rung out the communication cable. Determine which pin
connects with each wire of the cable.
2.
Connect the communication cable to the ERS 500 as follows:
Parameter
Description
P770 (2)* = 3
Modbus RTU slave
P771 (2) = 1
Modbus slave address of 1
P772 (2) = 9.6
9600 baud
P773 (2) = 0
no parity
P774 (2) = 8
8 data bits
P775 (2) = 1
1 stop bit
P776 (2) = 0
no flow control
P777 (2) = 0
no key up delay
P778 (2) = 1
answer only
P779 (2) = 300
Modem inactivity timeout = 300
38 RXD
RXD
DB-9
CONNECTOR
ERS 500
TERMINAL
BLOCK
GND
GND
39
TXD
TXD
40
41
6
2 1
5 3
4
8 7
Siemens Hardware
