Nokeval RCS770 Manuale utente
1
RCS770
USB / RS-485 / RS-232 converter
User Manual
23.5.2006
V1.0
INTRODUCTION
RCS770 s a general-purpose ser al converter equ pped w th a USB port, RS-232 port and two RS-485 ports.
Convers on can be done n all d rect ons. Alternat vely, th s converter can act as a RS-485 repeater allow ng
more RS-485 dev ces to be used, s nce one bus can normally hold 32 dev ces. The two RS-485 ports can be
conf gured to act as a s ngle full-duplex RS-422 port or a four-w re RS-485 port.
USB, RS-232 and RS-485 sect ons are galvan cally solated from each other, wh ch w ll el m nate ground
loops and g ve more tolerance aga nst d sturbances and overvoltages. However, the two RS-485 buses are
not solated from each other.
If RCS770 s connected to a computer v a USB, t creates a v rtual ser al port that can be used just l ke an
ord nary port. Every converter has an nd v dual ser al number, and the converter w ll reta n the same COM
port number even f plugged nto a d fferent USB port on the same computer. Th s ncreases rel ab l ty.
RCS770 s able to pass var ous ser al protocols, nclud ng Nokeval SCL, Modbus ASCII, Modbus RTU, and
HART. The RS-485 d rect on s changed automat cally, no handshake l nes are requ red.
RS-485 bus s attached v a screw term nals, avo d ng the need to make solder jo nts on f eld.
SPECIFICATIONS
USB port
Vers on: USB 1.1 or 2.0
Interface ch p: FTDI FT232R
Power consumpt on: < 200 mA
Connector: USB-B (A-B cable ncluded)
RS-485 ports
Baud rates 300…230400 b t/s, except
as a repeater 1200…
115200.
Data b ts 5…8
Par ty All supported
Stop b ts 1, 1.5 or 2 on USB, 1 on
RS-232
Bus length 1000 m max
Dev ces on bus max 32 standard dev ces or
128 1/4 load dev ces
Load 1/4 load (128 dev ces of
th s k nd can ex st on the
same bus)
Transm tter enable Automat c
RS-232 port
Connector: D9 male (DTE) (null modem
cable for PC ncluded)
Baud rates: 1200, 2400, 4800, 9600,
19200, 38400, 57600,
115200
Handshake l nes: Not controllable, l nked
nternally
External po er supply
Note: external power supply s not necessary when
the USB s used.
Voltage: 8…28 VDC
Current: <200 mA
General
D mens ons: 70x85x60 mm + connectors
Oper. temperature: -30...60 °C
Galvan c solat on: Yes, 2kV AC/DC
EMC
EMC mmun ty EN 61326
EMC em ss ons EN 61326 class B
2
CONVERSION MODE
The convers on mode and other sett ngs are done w th jumpers. To access them, the enclosure has to be
opened. Insert a small flat blade screwdr ver between the l d and the bottom part of the enclosure left or r ght
s de and pull the l d off.
The converter s factory pre-set as a USB–485 converter, all baud rates allowed. RS-485 buses are
term nated and have fa l-safes on.
Every convers on mode has a page of ts own. After these, there are some pages about nstall ng the USB
dr vers and other add t onal nformat on.
Connectors
Conn Purpose
J3 RS-485 bus 2, or RS-422 bus Tx
J4 RS-485 bus 1, or RS-422 bus Rx
J8 An external power supply can be connected here,
see page 10
J7 An external power supply can be connected here
J6 RS-232 port
J2 USB port
Indicators
LED Purpose
D1 Th s converter s powered up. USB dr vers are
work ng.
D2 Th s converter s rece v ng data from PC v a USB
D3 Th s converter s send ng data to PC v a USB
Jumpers
Jumper Purpose
J1 RS-485 bus 2 term nat on and fa l-safe
J5 RS-485 bus 1 term nat on and fa l-safe
J14 Connects the power supply of the bus dev ces and th s converter together, see page 10.
J11
Baud rate and b t format select on. Not used when USB s used.
J13 Programm ng connector for the m crocontroller. The m ddle p ns must be jumped.
J10 and J12 Convers on mode. Modes are expla ned on the follow ng pages.
J9 Closed when 485–485 repeater, open otherw se.
3
4 3 2 1 4 3 2 1 3 2 1 J7
J6
J2
J3 J4 J8
J1 J5
J10
J12
J13
J11
J9
J14
D1
D2 D3
1200 2400 4800 9600 19200 38400 57600 115200 8N1, 7E1, 7O1, 7N2 8E1, 8O1, 8N2, 9N1
USB – RS-485
Jumpers
•To set n USB – RS-485 mode, set J10 and J12 accord ng to the p cture.
•J1 and J5 def ne the 485 bus term nat on, see page 12.
•J14 controls the power supply opt ons, see page 10.
•J11 and J9 are not used.
Connections
•USB s connected to a computer. See page 11 on dr vers.
•RS-485 buses J3 are J4 equal. Any or both of them may be used. See page 12.
•No external power supply s requ red, but J8 can be used to power up the RS-485 dev ces connected n
connectors J3 and J4. The power supply s routed from J8 to J3 term nal 1 and J4 term nal 1.
4
Power
supply
(opt onal)
4 3 2 1 4 3 2 1 3 2 1 J7
J6
J2
J3 J4 J8
J1 J5
J10
J12
J13
J11
J9
J14
D1
D2 D3
USB
RS-485
dev ce
C
D1D0 + C +
USB – RS-422
Jumpers
•Set J10 and J12 accord ng to the p cture.
•J1 and J5 def ne the 485 bus term nat on, see page 12.
•J14 controls the power supply opt ons, see page 10.
•J11 and J9 are not used.
Connections
•USB s connected to a computer. See page 11 on dr vers.
•J3 and J4 are the RS-422 bus. Th s dev ce transm ts at J3 and rece ves at J4.
•No external power supply s requ red.
5
Power
supply
(opt onal)
4 3 2 1 4 3 2 1 3 2 1 J7
J6
J2
J3 J4 J8
J1 J5
J10
J12
J13
J11
J9
J14
D1
D2 D3
USB
RS-422
dev ce
C
T1T0 + C +
R1R0
Rx-
Rx+
Tx-
Tx+
Common
Power
USB – RS-232
Jumpers
•The USB–232 mode s selected w th jumpers J9, J10, and J12 accord ng to the p cture.
•J1, J5, J11, and J14 have no effect.
Connections
•USB s connected to a computer. See page 11 on dr vers.
•How to use the RS-232 bus, see page 15.
•No external power supply s needed.
6
4 3 2 1 4 3 2 1 3 2 1 J7
J2
J3 J4 J8
J1 J5
J10
J12
J13
J11
J9
J14
D1
D2 D3
USB
J6
RS-232
RS-232 – RS-485
Jumpers
•To select 232–485 mode, set jumpers J9, J10, and J12 accord ng to the p cture.
•J1 and J5 select the 485 bus term nat ons, see page 12.
•J14 controls the power supply flow onto the bus, see page 10.
•J11 s used to control the baud rate and b t format:
Connections
•RS-485 buses J3 and J4 are equal. Any or both of them may be used. See page 12.
•RS-232 bus s expla ned on page 15.
•Th s converter must be powered externally on J7 or J8, see page 10.
7
4 3 2 1 4 3 2 1 3 2 1
J6
J2
J3 J4 J8
J1 J5
J10
J12
J13
J11
J9
J14
D1
D2 D3
RS-485
dev ce
CD1D0 +
RS-232
Mascot
J7
+-
1200 2400 4800 9600 19200 38400 57600 115200 8N1, 7E1, 7O1, 7N2 8E1, 8O1, 8N2, 9N1
RS-232 – RS-422
Jumpers
•232–422 mode s selected w th jumpers J9, J10, and
J12 accord ng to the p cture.
•J1 and J5 def ne 422 bus term nat on, see page 14.
•J14 controls power supply opt ons, see page 10.
•J11 selects the baud rate and b t format, see p cture
below.
Connectors
•J3 s RS-422 Tx and J4 s Rx. See page 14.
•RS-232 s expla ned on page 15.
•An external power supply must be connected n J7 or
J8, see page 10.
8
4 3 2 1 4 3 2 1 3 2 1
J6
J2
J3 J4 J8
J1 J5
J10
J12
J13
J11
J9
J14
D1
D2 D3
RS-232
+-
RS-422
dev ce
C
T1T0 +
R1R0
Rx-
Rx+
Tx-
Tx+
Common
Power
Mascot
J7
1200 2400 4800 9600 19200 38400 57600 115200 8N1, 7E1, 7O1, 7N2 8E1, 8O1, 8N2, 9N1
RS-485 REPEATER
Jumpers
•485 repeater mode s selected w th jumpers J9, J10, and J12 accord ng to the p cture.
•J1 and J5 def ne the 485 bus term nat on, see page 12.
•J14 controls the power supply opt ons, see page 10.
•J11 selects the baud rate and b t format:
Connectors
•J3 and J4 are the RS-485 buses. Data on e ther bus s repeated onto the other.
•Th s converter must be powered up from an external supply brought to connector J7 or J8. See page 10.
9
4 3 2 1 4 3 2 1 3 2 1
J6
J2
J3 J4 J8
J1 J5
J10
J12
J13
J11
J9
J14
D1
D2 D3
RS-485
dev ce
C
D1D0 +J7
RS-485
dev ce
C
D1D0 +
Mascot
9V
1200 2400 4800 9600 19200 38400 57600 115200 8N1, 7E1, 7O1, 7N2 8E1, 8O1, 8N2, 9N1
SUPPLY VOLTAGE
Supply voltage for RCS770
If USB s used, RCS770 does not need other power supply for tself. If USB s not used, an external power
supply s needed.
The external supply s connected to connector J7 or J8. If you use J8, read the sect on ”Jumper J14” below.
J7 s a 1.3 mm DC jack and t accepts voltage between 8 and 28 VDC. If 230 VAC socket s ava lable,
Nokeval recommends Mascot 8311-9V-3635 AC/DC adaptor, ava lable separately.
Supply voltage for the bus devices
It s somet mes conven ent to bu ld the RS-485 bus w th a four w re cable cons st ng of common, power
supply, and two data l nes. Th s s why RCS770 has four term nals on each bus connector: one of the
term nals s reserved for supply voltage. RCS770 does not generate th s supply voltage and t must be
brought to connector J8 or J7. If you use J7, read the sect on ”Jumper J14” below.
RCS770 tself does not care wh ch way the bus dev ces are powered. Th s power supply rout ng s prov ded
only to make the cabl ng eas er.
The voltage can be anyth ng as long as t does not exceed 30 VDC because there s a 33 V var stor
protect ng from voltage surges.
Jumper J14
If jumper J14 s open, J7 s used to prov de the supply voltage for RCS770 tself and J8 s used to prov de the
supply voltage for the RS-485 bus dev ces.
If jumper J14 s closed, these two c rcu ts are nterconnected. You can br ng the external power supply at
e ther J7 or J8 and n both cases the same power supply w ll be used for both RCS770 and the bus dev ces.
10
3 24 3
Supply
24V
3 241 2 11
+-
USB
Mascot
RS-232
485 c rcu ts
232 c rcu ts
J14
J3 J4 J8
J7
Separate supply for
RCS770 and bus
dev ces
Common supply
J14
Isolat on
Indice
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