R1M-A1
P. / 5
EM-5660 Rev.5
ABBR.
PIN NO. EXPLANATION OF FUNCTION
BA (SD)
2
Transmitted Data
BB (RD)
3
Received Data
AB (SG)
5
Signal Common
CB (CS)
7
Clear to Send
CA (RS)
8
Request to Send
1
Not Used.
4
DO NOT connect. Connecting may
6
cause malfunctions.
9
1
5
6
9
■
RS-232C INTERFACE
MODBUS WIRING CONNECTION
R1M
T1
T2
T3
T4
R1M
T1
T2
T3
T4
T1
T2
T3
T4
R1M
CONNECTO
R
RS-232C
RS-485
*
1
*
1
*
1. Internal terminating resistor is used when the device is at the end of a transmission line.
*
2. Install shielded cables to all sections and ground them at single point.
*
2
FG
RS-485
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) Power input: Check supply voltage.
ADJUSTMENT PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
