K&R GT600-4T132G User Manual page 267

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PROFIBUS-DPbus topology
485+
485-
120Ω
terminal
resistor
485+ 485- CGND
Master
It is necessary to connect a matching terminal resistor to the end of PROFIBUS bus
and set DIP switch properly. The system PEs must be reliably grounded.
Length of communication cable between GT60DP2 and PROFIBUS-DP master varies
with different setting of baud rate of the master. Restrict communication cable lead
length strictly according to the Siemens DB9 standard. The following table describes
requirements on baud rate and communication cable lead length.
Baud Rate (Kbps)
9.6
19.2
187.5
500
1500
3000
6000
12000
RS485 bus
CGND
485+ 485- CGND
J3
MD38TX1
GT600
slave 1
Max. Length of Lead A (m)
1200
1200
600
200
100
100
100
100
8. Peripherals and Options
120Ω
terminal
resistor
485+ 485- CGND
Set J3 to
match terminal
J3
resistor
MD38TX1
GT600
slave N
Max. Length of Lead B (m)
1200
1200
600
200
70
Not supported
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