503
E5ZE Temperature Controller Read Protocol Appendix H
RS422/485 Connections
• RS-485 2-wire Connections
Note Terminal block pins 1 and 2 cannot be connected. If these blocks are used, operation of the E5ZE may
fail.
Pin No. Signal name Abbreviation Signal direction
1 Disabled (Do not connect.) --- ---
2 Disabled (Do not connect.) --- ---
3 Signal ground SG ---
4 Terminal B (+ side) B I/O
5 Terminal A (– side) A I/O
6.8 V
Turn off the communications switch
to disconnect terminating resistance.
Terminating
resistance
240 Ω
SN751177N or
equivalent
Terminating
resistance
Shield
Shield
Serial Commu-
nications Board/Unit
E5ZE
E5ZE
Signal
name
Pin
No.
Te r-
minal
Signal
name
Signal
name
RS-485: D-sub
9-pin female
RS-485: Terminals
RS-485: Terminals
Hood
*1: Set the 2-/4-wire switch
to the 2-wire setting.
*2: Turn ON the terminat-
ing resistance switch.
FG
B
A
2
1
SG
3
4
5
B
A
SG
3
4
5
B
A
240 Ω
4.7 kΩ
4.7 kΩ
51 kΩ
51 kΩ
5 V
RX
TX
Te r -
minal
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